diff --git a/README.md b/README.md
index 9f508d3a..2017c1be 100644
--- a/README.md
+++ b/README.md
@@ -125,7 +125,7 @@ Otherwise see below for OS specific instructions.
 
 **Ubuntu with Docker**
 
-The Docker support for Clusterio is curently broken.
+The Docker support for Clusterio is currently broken.
 If you need it open an issue about it.
 
 <!--
diff --git a/docs/managing-a-cluster.md b/docs/managing-a-cluster.md
index 205a548d..dca36cff 100644
--- a/docs/managing-a-cluster.md
+++ b/docs/managing-a-cluster.md
@@ -42,6 +42,15 @@ List instances.
 
 Create a new instance. `name` is the instance name. `--id` is the optional id.
 
+### Kill instance
+
+    ctl> instance kill <name>
+
+Terminates the running Factorio server without giving it a chance to save or cleanup after itself.
+
+Note: This may cause loss of data.
+
+
 ### Config management
 
 #### List Configuration
diff --git a/packages/ctl/ctl.js b/packages/ctl/ctl.js
index 9e48860f..b4cc3e5d 100755
--- a/packages/ctl/ctl.js
+++ b/packages/ctl/ctl.js
@@ -755,6 +755,19 @@ instanceCommands.add(new libCommand.Command({
 	},
 }));
 
+instanceCommands.add(new libCommand.Command({
+	definition: ["kill <instance>", "Kill instance", (yargs) => {
+		yargs.positional("instance", { describe: "Instance to kill", type: "string" });
+	}],
+	handler: async function(args, control) {
+		let instanceId = await libCommand.resolveInstance(control, args.instance);
+		await control.setLogSubscriptions({ instance_ids: [instanceId] });
+		await libLink.messages.killInstance.send(control, {
+			instance_id: instanceId,
+		});
+	},
+}));
+
 instanceCommands.add(new libCommand.Command({
 	definition: ["delete <instance>", "Delete instance", (yargs) => {
 		yargs.positional("instance", { describe: "Instance to delete", type: "string" });
diff --git a/packages/lib/factorio/server.js b/packages/lib/factorio/server.js
index 60070550..cbe6bb39 100644
--- a/packages/lib/factorio/server.js
+++ b/packages/lib/factorio/server.js
@@ -409,6 +409,7 @@ const outputHeuristics = [
  * - game-ready - invoked when the server is finished starting up
  * - autosave-start - invoked when the server starts an autosave
  * - autosave-fnished - invoked when the autosave finished
+ * - save-finished - invoked when the server has finished a manual save
  * - exit - invoked when the sterver has exited
  * @extends events.EventEmitter
  * @memberof module:lib/factorio
@@ -487,6 +488,7 @@ class FactorioServer extends events.EventEmitter {
 
 		// Array of possible causes for an unexpected shutdown
 		this._unexpected = [];
+		this._killed = false;
 
 		// Track autosaving
 		this._runningAutosave = null;
@@ -499,6 +501,8 @@ class FactorioServer extends events.EventEmitter {
 			if (this._runningAutosave) {
 				this.emit("autosave-finished", this._runningAutosave);
 				this._runningAutosave = null;
+			} else {
+				this.emit("save-finished");
 			}
 		});
 	}
@@ -694,28 +698,30 @@ class FactorioServer extends events.EventEmitter {
 	_watchExit() {
 		this._server.on("exit", (code, signal) => {
 			if (this._state !== "stopping") {
-				if (this._unexpected.length === 0) {
-					if (signal === "SIGKILL") {
+				if (signal === "SIGKILL") {
+					if (this._killed) {
+						this.emit("error", new libErrors.EnvironmentError("Factorio server was killed"));
+					} else {
 						this.emit("error", new libErrors.EnvironmentError(
 							"Factorio server was unexpectedly killed, is the system low on memory?"
 						));
-
-					} else {
-						let msg;
-						if (code !== null) {
-							msg = `Factorio server unexpectedly shut down with code ${code}`;
-						} else {
-							msg = `Factorio server was unexpectedly shut by down by signal ${signal}`;
-						}
-
-						this.emit("error", new Error(msg));
 					}
 
+				} else if (this._unexpected.length === 0) {
+					let msg;
+					if (code !== null) {
+						msg = `Factorio server unexpectedly shut down with code ${code}`;
+					} else {
+						msg = `Factorio server was unexpectedly shut by down by signal ${signal}`;
+					}
+
+					this.emit("error", new libErrors.EnvironmentError(msg));
+
 				} else if (this._unexpected.length === 1) {
-					this.emit("error", new Error(this._unexpected[0]));
+					this.emit("error", new libErrors.EnvironmentError(this._unexpected[0]));
 
 				} else {
-					this.emit("error", new Error(
+					this.emit("error", new libErrors.EnvironmentError(
 						"Factorio server unexpectedly shut down. Possible causes:"+
 						`\n- ${this._unexpected.join("\n- ")}`
 					));
@@ -1004,12 +1010,18 @@ class FactorioServer extends events.EventEmitter {
 	 * Kill the server
 	 *
 	 * Terminates the server without any cleanup or saving.
+	 * @param {boolean} [unexpected=false] -
+	 *     If true raise an error event as a result of killing the Factorio
+	 *     process.
 	 */
-	async kill() {
+	async kill(unexpected = false) {
 		this._check(["running", "stopping"]);
-		this._state = "stopping";
+		this._killed = true;
+		if (!unexpected) {
+			this._state = "stopping";
+		}
 		this._server.kill("SIGKILL");
-		await events.once(this._server, "exit");
+		await new Promise(resolve => this._server.once("exit", resolve));
 	}
 
 	/**
diff --git a/packages/lib/link/messages.js b/packages/lib/link/messages.js
index ea3d0aae..06135ff4 100644
--- a/packages/lib/link/messages.js
+++ b/packages/lib/link/messages.js
@@ -636,6 +636,13 @@ messages.stopInstance = new Request({
 	forwardTo: "instance",
 });
 
+messages.killInstance = new Request({
+	type: "kill_instance",
+	links: ["control-master", "master-slave", "slave-instance"],
+	permission: "core.instance.kill",
+	forwardTo: "instance",
+});
+
 messages.deleteInstance = new Request({
 	type: "delete_instance",
 	links: ["control-master", "master-slave"],
diff --git a/packages/lib/plugin.js b/packages/lib/plugin.js
index 796b9b6c..72c6dbc1 100644
--- a/packages/lib/plugin.js
+++ b/packages/lib/plugin.js
@@ -78,7 +78,7 @@ class BaseInstancePlugin {
 	 * changed.
 	 *
 	 * @param {module:lib/config.ConfigGroup} group -
-	 *     The group who's field got changed on.
+	 *     The group who's field got changed.
 	 * @param {string} field - Name of the field that changed.
 	 * @param {*} prev - The previous value of the field.
 	 */
@@ -355,6 +355,19 @@ class BaseMasterPlugin {
 	 */
 	async onInstanceStatusChanged(instance, prev) { }
 
+	/**
+	 * Called when the value of a master config field changed.
+	 *
+	 * Invoked after the value of the config field given by `field` has
+	 * changed on the master.
+	 *
+	 * @param {module:lib/config.ConfigGroup} group -
+	 *     The group who's field got changed.
+	 * @param {string} field - Name of the field that changed.
+	 * @param {*} prev - The previous value of the field.
+	 */
+	async onMasterConfigFieldChanged(group, field, prev) { }
+
 	/**
 	 * Called when the value of an instance config field changed.
 	 *
@@ -363,7 +376,7 @@ class BaseMasterPlugin {
 	 *
 	 * @param {Object} instance - The instance the config changed on.
 	 * @param {module:lib/config.ConfigGroup} group -
-	 *     The group who's field got changed on.
+	 *     The group who's field got changed.
 	 * @param {string} field - Name of the field that changed.
 	 * @param {*} prev - The previous value of the field.
 	 */
@@ -575,11 +588,14 @@ class BaseControlPlugin {
 
 /**
  * Plugin supplied pages
- * @typedef {Object} module:Lib/plugin~Page
+ * @typedef {Object} module:lib/plugin~Page
  * @property {string} path - URL path to this page.
  * @property {string=} sidebarPath -
  *     If present and this path matches one of the pages in the sidebar it
  *     will cause that sidebar entry to be highlighted as active.
+ * @property {string=} sidebarGroup -
+ *     If present group this entry under a group of the given name in the
+ *     sidebar.
  * @property {string=} sidebarName -
  *     If present creates an entry in the sidebar for this page with the
  *     given text.
@@ -640,6 +656,42 @@ class BaseWebPlugin {
 		 * @type {Array<module:lib/plugin~Page>}
 		 */
 		this.pages = [];
+
+		/**
+		 * Extra react component to add to core components
+		 *
+		 * Interface to augment core components of the web UI.  Setting a
+		 * component as one of the supported properties of this object will
+		 * cause the web UI to render it when displaying that component,
+		 * usually at the end.  Each component will receive a `plugin` param
+		 * which is the instance of the web plugin that contained the
+		 * component extra.
+		 *
+		 * @type {object}
+		 * @property {React.ComponentType} MasterPage -
+		 *     Placed at the end of the master page.
+		 * @property {React.ComponentType} SlavesPage -
+		 *     Placed at the end of the slaves list page.
+		 * @property {React.ComponentType} SlaveViewPage -
+		 *     Placed at the end of each slave page.  Takes a `slave` param
+		 *     which is the slave the page is displayed for.
+		 * @property {React.ComponentType} InstancesPage -
+		 *     Placed at the end of the instance list page.
+		 * @property {React.ComponentType} InstanceViewPage -
+		 *     Placed at the end of each instance page.  Takes an `instance`
+		 *     param which is the instance the page is displayed for.
+		 * @property {React.ComponentType} UsersPage -
+		 *     Placed at the end of the users list page.
+		 * @property {React.ComponentType} UserViewPage -
+		 *     Placed at the end of each user page.  Takes a `user` param
+		 *     which is the user object the page is displayed for.
+		 * @property {React.ComponentType} RolesPage -
+		 *     Placed at the end of the roles list page.
+		 * @property {React.ComponentType} RoleViewPage -
+		 *     Placed at the end of each role page.  Takes a `role` param
+		 *     which is the role object the page is displayed for.
+		 */
+		this.componentExtra = {};
 	}
 
 	/**
diff --git a/packages/lib/users.js b/packages/lib/users.js
index 4b42425b..f5f59f1a 100644
--- a/packages/lib/users.js
+++ b/packages/lib/users.js
@@ -427,6 +427,11 @@ definePermission({
 	title: "Stop instance",
 	description: "Stop instances.",
 });
+definePermission({
+	name: "core.instance.kill",
+	title: "Kill instance",
+	description: "Terminate running instances without saving or cleanup.",
+});
 definePermission({
 	name: "core.instance.delete",
 	title: "Delete instance",
diff --git a/packages/master/src/Master.js b/packages/master/src/Master.js
index 28809002..3d83e849 100644
--- a/packages/master/src/Master.js
+++ b/packages/master/src/Master.js
@@ -162,6 +162,9 @@ class Master {
 		this.userManager = new UserManager(this.config);
 		await this.userManager.load(path.join(databaseDirectory, "users.json"));
 
+		this.config.on("fieldChanged", (group, field, prev) => {
+			libPlugin.invokeHook(this.plugins, "onMasterConfigFieldChanged", group, field, prev);
+		});
 		for (let instance of this.instances.values()) {
 			this.addInstanceHooks(instance);
 		}
diff --git a/packages/slave/modules/clusterio/serialize.lua b/packages/slave/modules/clusterio/serialize.lua
index a1e641c1..f9a77da0 100644
--- a/packages/slave/modules/clusterio/serialize.lua
+++ b/packages/slave/modules/clusterio/serialize.lua
@@ -49,7 +49,7 @@ local has_create_grid = version_ge("1.1.7")
 -- If the equipment is a burner the following is also present:
 --	 i: burner inventory
 --	 r: result inventory
---	 b: curently burning (optional)
+--	 b: currently burning (optional)
 --	 f: remaining_burning_fuel (optional)
 function serialize.serialize_equipment_grid(grid)
 	local serialized = {}
diff --git a/packages/slave/slave.js b/packages/slave/slave.js
index cbcb0098..f4916ff8 100755
--- a/packages/slave/slave.js
+++ b/packages/slave/slave.js
@@ -186,7 +186,11 @@ class Instance extends libLink.Link {
 		});
 
 		this.server.on("error", err => {
-			this.logger.error(`Error in instance ${this.name}:\n${err.stack}`);
+			if (err instanceof libErrors.EnvironmentError) {
+				this.logger.error(err.message);
+			} else {
+				this.logger.error(`${this.name}:\n${err.stack}`);
+			}
 		});
 
 		this.server.on("autosave-finished", name => {
@@ -195,6 +199,12 @@ class Instance extends libLink.Link {
 			});
 		});
 
+		this.server.on("save-finished", () => {
+			this.sendSaveListUpdate().catch(err => {
+				this.logger.error(`Error handling save-finished in instance ${this.name}:\n${err.stack}`);
+			});
+		});
+
 		this.server.on("ipc-player_event", event => {
 			libLink.messages.playerEvent.send(this, {
 				instance_id: this.id,
@@ -697,6 +707,13 @@ class Instance extends libLink.Link {
 		}
 	}
 
+	async kill() {
+		if (this._status === "stopped") {
+			return;
+		}
+		await this.server.kill(true);
+	}
+
 	async masterConnectionEventEventHandler(message) {
 		await libPlugin.invokeHook(this.plugins, "onMasterConnectionEvent", message.data.event);
 	}
@@ -833,6 +850,10 @@ class Instance extends libLink.Link {
 		await this.stop();
 	}
 
+	async killInstanceRequestHandler() {
+		await this.kill();
+	}
+
 	async sendRconRequestHandler(message) {
 		let result = await this.sendRcon(message.data.command);
 		return { result };
diff --git a/packages/web_ui/src/components/InstanceList.jsx b/packages/web_ui/src/components/InstanceList.jsx
index 7163608a..19f17b32 100644
--- a/packages/web_ui/src/components/InstanceList.jsx
+++ b/packages/web_ui/src/components/InstanceList.jsx
@@ -1,10 +1,11 @@
 import React from "react";
 import { useHistory } from "react-router-dom";
-import { message, Button, Table } from "antd";
+import { message, Button, Space, Table } from "antd";
 import CopyOutlined from "@ant-design/icons/CopyOutlined";
 
 import { useSlaveList } from "../model/slave";
 import InstanceStatusTag from "./InstanceStatusTag";
+import StartStopInstanceButton from "./StartStopInstanceButton";
 
 const strcmp = new Intl.Collator(undefined, { numerice: "true", sensitivity: "base" }).compare;
 
@@ -43,6 +44,7 @@ export default function InstanceList(props) {
 			key: "assigned_slave",
 			render: instance => slaveName(instance["assigned_slave"]),
 			sorter: (a, b) => strcmp(slaveName(a["assigned_slave"]), slaveName(b["assigned_slave"])),
+			responsive: ["sm"],
 		},
 		{
 			title: "Public address",
@@ -63,13 +65,24 @@ export default function InstanceList(props) {
 				</> : "";
 			},
 			sorter: (a, b) => strcmp(slavePublicAddress(a["assigned_slave"]), slavePublicAddress(b["assigned_slave"])),
+			responsive: ["lg"],
 		},
 		{
 			title: "Status",
-			dataIndex: "status",
-			render: status => <InstanceStatusTag status={status} />,
+			key: "status",
+			render: instance => <InstanceStatusTag status={instance["status"]} />,
 			sorter: (a, b) => strcmp(a["status"], b["status"]),
 		},
+		{
+			key: "action",
+			render: instance => <StartStopInstanceButton
+				buttonProps={{ size: "small" }}
+				instance={instance}
+			/>,
+			responsive: ["sm"],
+			align: "right",
+			width: 100,
+		},
 	];
 
 	if (props.hideAssignedSlave) {
diff --git a/packages/web_ui/src/components/InstanceViewPage.jsx b/packages/web_ui/src/components/InstanceViewPage.jsx
index c56be6bd..3b3e26c0 100644
--- a/packages/web_ui/src/components/InstanceViewPage.jsx
+++ b/packages/web_ui/src/components/InstanceViewPage.jsx
@@ -1,13 +1,15 @@
 import React, { useContext, useState } from "react";
 import { useHistory, useParams } from "react-router-dom";
-import { Alert, Button, Descriptions, Popconfirm, Space, Spin, Typography } from "antd";
+import { Alert, Button, Descriptions, Dropdown, Menu, Modal, PageHeader, Space, Spin, Typography } from "antd";
 import DeleteOutlined from "@ant-design/icons/DeleteOutlined";
+import DownOutlined from "@ant-design/icons/DownOutlined";
 
 import { libLink } from "@clusterio/lib";
 
 import { useAccount } from "../model/account";
 import ControlContext from "./ControlContext";
 import PageLayout from "./PageLayout";
+import PluginExtra from "./PluginExtra";
 import InstanceConfigTree from "./InstanceConfigTree";
 import LogConsole from "./LogConsole";
 import InstanceRcon from "./InstanceRcon";
@@ -23,6 +25,36 @@ import InstanceStatusTag from "./InstanceStatusTag";
 const { Title } = Typography;
 
 
+function InstanceDescription(props) {
+	let account = useAccount();
+
+	const { slave, instance } = props;
+	let assigned = instance["assigned_slave"] !== null;
+	return <Descriptions
+		bordered
+		size="small"
+	>
+		<Descriptions.Item label="Slave">
+			{!assigned
+				? <em>Unassigned</em>
+				: slave["name"] || instance["assigned_slave"]
+			}
+			{account.hasPermission("core.instance.assign") && <AssignInstanceModal
+				id={instance["id"]}
+				slaveId={instance["assigned_slave"]}
+				buttonProps={{
+					size: "small",
+					style: { float: "Right" },
+					type: assigned ? "default" : "primary",
+					disabled: !["unknown", "unassigned", "stopped"].includes(instance["status"]),
+				}}
+				buttonContent={assigned ? "Reassign" : "Assign"}
+			/>}
+		</Descriptions.Item>
+		<Descriptions.Item label="Status"><InstanceStatusTag status={instance["status"]} /></Descriptions.Item>
+	</Descriptions>;
+}
+
 export default function InstanceViewPage(props) {
 	let params = useParams();
 	let instanceId = Number(params.id);
@@ -60,16 +92,9 @@ export default function InstanceViewPage(props) {
 		</PageLayout>;
 	}
 
-	let instanceButtons = <Space>
-		{
-			account.hasAnyPermission("core.instance.start", "core.instance.stop")
-			&& <StartStopInstanceButton instance={instance} />
-		}
-		{account.hasPermission("core.instance.load_scenario") && <LoadScenarioModal instance={instance} />}
-		{account.hasPermission("core.instance.export_data") && <Button
-			loading={exportingData}
-			disabled={instance.status !== "stopped"}
-			onClick={() => {
+	let instanceButtonsMenu = <Menu
+		onClick={({ key }) => {
+			if (key === "export") {
 				setExportingData(true);
 				libLink.messages.exportData.send(
 					control, { instance_id: instanceId }
@@ -78,59 +103,69 @@ export default function InstanceViewPage(props) {
 				).finally(() => {
 					setExportingData(false);
 				});
-			}}
-		>
-			Export data
-		</Button>}
-		{account.hasPermission("core.instance.delete") && <Popconfirm
-			title="Permanently delete instance and server saves?"
-			okText="Delete"
-			placement="bottomRight"
-			okButtonProps={{ danger: true }}
-			onConfirm={() => {
-				libLink.messages.deleteInstance.send(
+
+			} else if (key === "kill") {
+				libLink.messages.killInstance.send(
 					control, { instance_id: instanceId }
-				).then(() => {
-					history.push("/instances");
-				}).catch(notifyErrorHandler("Error deleting instance"));
-			}}
-		>
-			<Button
-				danger
+				).catch(notifyErrorHandler("Error killing instance"));
+
+			} else if (key === "delete") {
+				Modal.confirm({
+					autoFocusButton: "cancel",
+					content: "Permamently delete instance and server saves?",
+					okText: "Delete",
+					okButtonProps: { danger: true },
+					onOk: () => {
+						libLink.messages.deleteInstance.send(
+							control, { instance_id: instanceId }
+						).then(() => {
+							history.push("/instances");
+						}).catch(notifyErrorHandler("Error deleting instance"));
+					},
+				});
+			}
+		}}
+	>
+		{account.hasPermission("core.instance.export_data") && <Menu.Item
+			disabled={exportingData || instance.status !== "stopped"}
+			key="export"
+		>Export data</Menu.Item>}
+		{account.hasPermission("core.instance.kill") && <Menu.Item
+			disabled={["unknown", "unassigned", "stopped"].includes(instance["status"])}
+			key="kill"
+		>Kill process</Menu.Item>}
+		{account.hasPermission("core.instance.delete") && <>
+			<Menu.Divider />
+			<Menu.Item
 				disabled={!["unknown", "unassigned", "stopped"].includes(instance["status"])}
-			>
-				<DeleteOutlined />
-			</Button>
-		</Popconfirm>}
+				danger
+				key="delete"
+				icon={<DeleteOutlined />}
+			>Delete</Menu.Item>
+		</>}
+	</Menu>;
+	let instanceButtons = <Space>
+		{
+			account.hasAnyPermission("core.instance.start", "core.instance.stop")
+			&& <StartStopInstanceButton instance={instance} />
+		}
+		{account.hasPermission("core.instance.load_scenario") && <LoadScenarioModal instance={instance} />}
+		{account.hasAnyPermission(
+			"core.instance.export_data",
+			"core.instance.kill",
+			"core.instance.delete",
+		) && <Dropdown placement="bottomRight" trigger={["click"]} overlay={instanceButtonsMenu}>
+			<Button>More <DownOutlined /></Button>
+		</Dropdown>}
 	</Space>;
 
-	let assigned = instance["assigned_slave"] !== null;
 	return <PageLayout nav={nav}>
-		<Descriptions
-			bordered
-			size="small"
+		<PageHeader
+			className="site-page-header"
 			title={instance["name"]}
 			extra={instanceButtons}
-		>
-			<Descriptions.Item label="Slave">
-				{!assigned
-					? <em>Unassigned</em>
-					: slave["name"] || instance["assigned_slave"]
-				}
-				{account.hasPermission("core.instance.assign") && <AssignInstanceModal
-					id={instanceId}
-					slaveId={instance["assigned_slave"]}
-					buttonProps={{
-						size: "small",
-						style: { float: "Right" },
-						type: assigned ? "default" : "primary",
-						disabled: !["unknown", "unassigned", "stopped"].includes(instance["status"]),
-					}}
-					buttonContent={assigned ? "Reassign" : "Assign"}
-				/>}
-			</Descriptions.Item>
-			<Descriptions.Item label="Status"><InstanceStatusTag status={instance["status"]} /></Descriptions.Item>
-		</Descriptions>
+		/>
+		<InstanceDescription slave={slave} instance={instance} />
 
 		{
 			account.hasAllPermission("core.instance.save.list", "core.instance.save.list_subscribe")
@@ -147,5 +182,7 @@ export default function InstanceViewPage(props) {
 		}
 
 		{account.hasPermission("core.instance.get_config") && <InstanceConfigTree id={instanceId} />}
+
+		<PluginExtra component="InstanceViewPage" instance={instance} />
 	</PageLayout>;
 }
diff --git a/packages/web_ui/src/components/InstancesPage.jsx b/packages/web_ui/src/components/InstancesPage.jsx
index 3195c439..f8a988eb 100644
--- a/packages/web_ui/src/components/InstancesPage.jsx
+++ b/packages/web_ui/src/components/InstancesPage.jsx
@@ -7,6 +7,7 @@ import { libConfig, libLink } from "@clusterio/lib";
 import { useAccount } from "../model/account";
 import ControlContext from "./ControlContext";
 import PageLayout from "./PageLayout";
+import PluginExtra from "./PluginExtra";
 import { useInstanceList } from "../model/instance";
 import InstanceList from "./InstanceList";
 import { notifyErrorHandler } from "../util/notify";
@@ -94,5 +95,6 @@ export default function InstancesPage() {
 		/>
 
 		<InstanceList instances={instanceList} />
+		<PluginExtra component="InstancesPage" />
 	</PageLayout>;
 }
diff --git a/packages/web_ui/src/components/MasterPage.jsx b/packages/web_ui/src/components/MasterPage.jsx
index 8ba92848..b3637238 100644
--- a/packages/web_ui/src/components/MasterPage.jsx
+++ b/packages/web_ui/src/components/MasterPage.jsx
@@ -1,6 +1,7 @@
 import React from "react";
 import { Typography } from "antd";
 
+import PluginExtra from "./PluginExtra";
 import LogConsole from "./LogConsole";
 import { useAccount } from "../model/account";
 import MasterConfigTree from "./MasterConfigTree";
@@ -9,7 +10,7 @@ import PageLayout from "./PageLayout";
 const { Title } = Typography;
 
 
-export default function SlavesPage() {
+export default function MasterPage() {
 	let account = useAccount();
 
 	return <PageLayout nav={[{ name: "Master" }]}>
@@ -19,5 +20,6 @@ export default function SlavesPage() {
 			<LogConsole master={true} />
 		</>}
 		{account.hasPermission("core.master.get_config") && <MasterConfigTree />}
+		<PluginExtra component="MasterPage" />
 	</PageLayout>;
 };
diff --git a/packages/web_ui/src/components/PluginExtra.jsx b/packages/web_ui/src/components/PluginExtra.jsx
new file mode 100644
index 00000000..d862b856
--- /dev/null
+++ b/packages/web_ui/src/components/PluginExtra.jsx
@@ -0,0 +1,17 @@
+import React, { useContext } from "react";
+
+import ControlContext from "./ControlContext";
+
+
+export default function PluginExtra(params) {
+	let control = useContext(ControlContext);
+
+	let components = [];
+	for (let [name, plugin] of control.plugins) {
+		if (Object.prototype.hasOwnProperty.call(plugin.componentExtra, params.component)) {
+			let ComponentExtra = plugin.componentExtra[params.component];
+			components.push(<ComponentExtra key={name} plugin={plugin} {...params}/>);
+		}
+	}
+	return components;
+}
diff --git a/packages/web_ui/src/components/RoleViewPage.jsx b/packages/web_ui/src/components/RoleViewPage.jsx
index ddd7a9f0..892beca6 100644
--- a/packages/web_ui/src/components/RoleViewPage.jsx
+++ b/packages/web_ui/src/components/RoleViewPage.jsx
@@ -8,6 +8,7 @@ import { libLink, libUsers } from "@clusterio/lib";
 import { useAccount } from "../model/account";
 import ControlContext from "./ControlContext";
 import PageLayout from "./PageLayout";
+import PluginExtra from "./PluginExtra";
 import { notifyErrorHandler } from "../util/notify";
 
 
@@ -149,5 +150,6 @@ export default function RoleViewPage() {
 				</Form.Item>
 			))}
 		</Form>
+		<PluginExtra component="RoleViewPage" role={role} />
 	</PageLayout>;
 }
diff --git a/packages/web_ui/src/components/RolesPage.jsx b/packages/web_ui/src/components/RolesPage.jsx
index fc1ba59a..60221ebf 100644
--- a/packages/web_ui/src/components/RolesPage.jsx
+++ b/packages/web_ui/src/components/RolesPage.jsx
@@ -8,6 +8,7 @@ import { useAccount } from "../model/account";
 import ControlContext from "./ControlContext";
 import { notifyErrorHandler } from "../util/notify";
 import PageLayout from "./PageLayout";
+import PluginExtra from "./PluginExtra";
 
 const strcmp = new Intl.Collator(undefined, { numerice: "true", sensitivity: "base" }).compare;
 
@@ -99,5 +100,6 @@ export default function RolesPage() {
 				},
 			})}
 		/>
+		<PluginExtra component="RolesPage" />
 	</PageLayout>;
 }
diff --git a/packages/web_ui/src/components/SiteLayout.jsx b/packages/web_ui/src/components/SiteLayout.jsx
index 089b605d..5a547205 100644
--- a/packages/web_ui/src/components/SiteLayout.jsx
+++ b/packages/web_ui/src/components/SiteLayout.jsx
@@ -37,6 +37,27 @@ export default function SiteLayout(props) {
 		combinedPages.push(...plugin.pages);
 	}
 
+	let menuItems = [];
+	let menuGroups = new Map();
+	for (let { sidebarName, sidebarGroup, permission, path } of combinedPages) {
+		if (!sidebarName || permission && !account.hasPermission(permission)) {
+			continue;
+		}
+		if (sidebarGroup) {
+			let group = menuGroups.get(sidebarGroup);
+			if (!group) {
+				group = [];
+				menuGroups.set(sidebarGroup, group);
+			}
+			group.push(<Menu.Item key={path}>{sidebarName}</Menu.Item>);
+		} else {
+			menuItems.push(<Menu.Item key={path}>{sidebarName}</Menu.Item>);
+		}
+	}
+	for (let [name, group] of menuGroups) {
+		menuItems.push(<Menu.ItemGroup key={name} title={name}>{group}</Menu.ItemGroup>);
+	}
+
 	return <Layout style={{ minHeight: "100vh" }}>
 		<Header className="header">
 			<div className="site-logo" />
@@ -65,16 +86,12 @@ export default function SiteLayout(props) {
 			>
 				<Menu
 					mode="inline"
+					defaultOpenKeys={[...menuGroups.keys()]}
 					selectedKeys={[currentSidebarPath]}
 					style={{ height: "100%", borderRight: 0 }}
 					onClick={({ key }) => history.push(key)}
 				>
-					{combinedPages.map(({sidebarName, permission, path}) => {
-						if (!sidebarName || permission && !account.hasPermission(permission)) {
-							return null;
-						}
-						return <Menu.Item key={path}>{sidebarName}</Menu.Item>;
-					})}
+					{menuItems}
 				</Menu>
 			</Sider>
 			<Layout className="site-layout-content-container">
diff --git a/packages/web_ui/src/components/SlaveViewPage.jsx b/packages/web_ui/src/components/SlaveViewPage.jsx
index 12544ad0..14cdf423 100644
--- a/packages/web_ui/src/components/SlaveViewPage.jsx
+++ b/packages/web_ui/src/components/SlaveViewPage.jsx
@@ -8,6 +8,7 @@ import { useAccount } from "../model/account";
 import { useInstanceList } from "../model/instance";
 import { useSlave } from "../model/slave";
 import PageLayout from "./PageLayout";
+import PluginExtra from "./PluginExtra";
 
 const { Title } = Typography;
 
@@ -60,5 +61,6 @@ export default function SlaveViewPage(props) {
 			<Title level={5} style={{ marginTop: 16 }}>Console</Title>
 			<LogConsole slaves={[slaveId]} />
 		</>}
+		<PluginExtra component="SlaveViewPage" slave={slave} />
 	</PageLayout>;
 }
diff --git a/packages/web_ui/src/components/SlavesPage.jsx b/packages/web_ui/src/components/SlavesPage.jsx
index 24cb17ed..77e2fd9c 100644
--- a/packages/web_ui/src/components/SlavesPage.jsx
+++ b/packages/web_ui/src/components/SlavesPage.jsx
@@ -7,6 +7,7 @@ import { libLink } from "@clusterio/lib";
 import { useAccount } from "../model/account";
 import ControlContext from "./ControlContext";
 import PageLayout from "./PageLayout";
+import PluginExtra from "./PluginExtra";
 import { useSlaveList } from "../model/slave";
 import { notifyErrorHandler } from "../util/notify";
 
@@ -129,5 +130,6 @@ export default function SlavesPage() {
 				},
 			})}
 		/>
+		<PluginExtra component="SlavesPage" />
 	</PageLayout>;
 };
diff --git a/packages/web_ui/src/components/StartStopInstanceButton.jsx b/packages/web_ui/src/components/StartStopInstanceButton.jsx
index 89a58eac..00def970 100644
--- a/packages/web_ui/src/components/StartStopInstanceButton.jsx
+++ b/packages/web_ui/src/components/StartStopInstanceButton.jsx
@@ -11,7 +11,8 @@ export default function StartStopInstanceButton(props) {
 	let control = useContext(ControlContext);
 	let [switching, setSwitching] = useState(false);
 
-	function onClick() {
+	function onClick(event) {
+		event.stopPropagation();
 		setSwitching(true);
 		let action;
 		if (props.instance["status"] === "stopped") {
diff --git a/packages/web_ui/src/components/UserViewPage.jsx b/packages/web_ui/src/components/UserViewPage.jsx
index 4a9b2f3b..f2730fa4 100644
--- a/packages/web_ui/src/components/UserViewPage.jsx
+++ b/packages/web_ui/src/components/UserViewPage.jsx
@@ -8,6 +8,7 @@ import { libLink } from "@clusterio/lib";
 import { useAccount } from "../model/account";
 import ControlContext from "./ControlContext";
 import PageLayout from "./PageLayout";
+import PluginExtra from "./PluginExtra";
 import { notifyErrorHandler } from "../util/notify";
 
 
@@ -258,5 +259,6 @@ export default function UserViewPage() {
 				</Space>
 			</Form.Item>
 		</Form>
+		<PluginExtra component="UserViewPage" user={user} />
 	</PageLayout>;
 }
diff --git a/packages/web_ui/src/components/UsersPage.jsx b/packages/web_ui/src/components/UsersPage.jsx
index 296fd1ce..397db3d9 100644
--- a/packages/web_ui/src/components/UsersPage.jsx
+++ b/packages/web_ui/src/components/UsersPage.jsx
@@ -8,6 +8,7 @@ import { useAccount } from "../model/account";
 import ControlContext from "./ControlContext";
 import { notifyErrorHandler } from "../util/notify";
 import PageLayout from "./PageLayout";
+import PluginExtra from "./PluginExtra";
 
 const strcmp = new Intl.Collator(undefined, { numerice: "true", sensitivity: "base" }).compare;
 
@@ -121,5 +122,6 @@ export default function UsersPage() {
 				},
 			})}
 		/>
+		<PluginExtra component="UsersPage" />
 	</PageLayout>;
 }
diff --git a/test/integration/clusterio.js b/test/integration/clusterio.js
index 072f0180..b066d15f 100644
--- a/test/integration/clusterio.js
+++ b/test/integration/clusterio.js
@@ -6,6 +6,7 @@ const events = require("events");
 
 const libLink = require("@clusterio/lib/link");
 const libUsers = require("@clusterio/lib/users");
+const { wait } = require("@clusterio/lib/helpers");
 
 const testStrings = require("../lib/factorio/test_strings");
 const {
@@ -252,6 +253,7 @@ describe("Integration of Clusterio", function() {
 		describe("instance create-save", function() {
 			it("creates a save", async function() {
 				slowTest(this);
+				getControl().saveListUpdates = [];
 				await execCtl("instance create-save test");
 				await checkInstanceStatus(44, "stopped");
 			});
@@ -325,8 +327,32 @@ describe("Integration of Clusterio", function() {
 		describe("instance send-rcon", function() {
 			it("sends the command", async function() {
 				slowTest(this);
-				await execCtl("instance send-rcon test test");
-				// TODO check that the command was received
+				await execCtl("instance send-rcon test technobabble");
+				let { log } = await libLink.messages.queryLog.send(getControl(), {
+					all: false,
+					master: false,
+					slave_ids: [],
+					instance_ids: [44],
+					max_level: null,
+					limit: 10,
+					order: "desc",
+				});
+				assert(log.some(info => /technobabble/.test(info.message)), "Command was not sent");
+			});
+
+			it("should trigger saveListUpdate on save", async function() {
+				slowTest(this);
+				getControl().saveListUpdates = [];
+				await execCtl("instance send-rcon test /server-save");
+				let received = false;
+				for (let x = 0; x < 10; x++) {
+					if (getControl().saveListUpdates.length) {
+						received = true;
+						break;
+					}
+					await wait(100);
+				}
+				assert(received, "saveListUpdate not sent");
 			});
 		});
 
@@ -481,22 +507,26 @@ describe("Integration of Clusterio", function() {
 				await execCtl("instance config set 44 research_sync.load_plugin false");
 				await execCtl("instance config set 44 statistics_exporter.load_plugin false");
 				await execCtl("instance config set 44 subspace_storage.load_plugin false");
-				try {
-					let exchangeString = testStrings.modified.replace(/[\n\r]+/g, "");
-					let args = `base/freeplay --seed 1234 --map-exchange-string "${exchangeString}"`;
-					await execCtl(`instance load-scenario test ${args}`);
-					await checkInstanceStatus(44, "running");
-					await sendRcon(44, '/c game.print("disable achievements")');
-					await sendRcon(44, '/c game.print("disable achievements")');
-					assert.equal(await sendRcon(44, "/c rcon.print(game.default_map_gen_settings.seed)"), "1234\n");
-					assert.equal(await sendRcon(44, "/c rcon.print(game.map_settings.pollution.ageing)"), "1.5\n");
-					assert.equal(
-						await sendRcon(44, "/c rcon.print(game.difficulty_settings.research_queue_setting)"), "never\n"
-					);
 
-				} finally {
-					await execCtl("instance stop test");
-				}
+				let exchangeString = testStrings.modified.replace(/[\n\r]+/g, "");
+				let args = `base/freeplay --seed 1234 --map-exchange-string "${exchangeString}"`;
+				await execCtl(`instance load-scenario test ${args}`);
+				await checkInstanceStatus(44, "running");
+				await sendRcon(44, '/c game.print("disable achievements")');
+				await sendRcon(44, '/c game.print("disable achievements")');
+				assert.equal(await sendRcon(44, "/c rcon.print(game.default_map_gen_settings.seed)"), "1234\n");
+				assert.equal(await sendRcon(44, "/c rcon.print(game.map_settings.pollution.ageing)"), "1.5\n");
+				assert.equal(
+					await sendRcon(44, "/c rcon.print(game.difficulty_settings.research_queue_setting)"), "never\n"
+				);
+			});
+		});
+
+		describe("instance kill", function() {
+			it("kills the instance", async function() {
+				slowTest(this);
+				await execCtl("instance kill test");
+				await checkInstanceStatus(44, "stopped");
 			});
 		});
 
diff --git a/test/lib/plugin.js b/test/lib/plugin.js
index 55159f4f..017385ae 100644
--- a/test/lib/plugin.js
+++ b/test/lib/plugin.js
@@ -62,6 +62,8 @@ describe("lib/plugin", function() {
 		});
 		it("should define defaults for hooks", async function() {
 			await masterPlugin.onInstanceStatusChanged({}, "running", "initialized");
+			await masterPlugin.onMasterConfigFieldChanged({}, "foo", null);
+			await masterPlugin.onInstanceConfigFieldChanged({}, {}, "foo", null);
 			await masterPlugin.onMetrics();
 			await masterPlugin.onShutdown();
 			masterPlugin.onSlaveConnectionEvent({}, "connect");