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diff --git a/devtools/client/framework/components/ToolboxController.js b/devtools/client/framework/components/ToolboxController.js
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+++ b/devtools/client/framework/components/ToolboxController.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const {
+  Component,
+  createFactory,
+} = require("devtools/client/shared/vendor/react");
+const ToolboxToolbar = createFactory(
+  require("devtools/client/framework/components/ToolboxToolbar")
+);
+const ELEMENT_PICKER_ID = "command-button-pick";
+
+/**
+ * This component serves as a state controller for the toolbox React component. It's a
+ * thin layer for translating events and state of the outside world into the React update
+ * cycle. This solution was used to keep the amount of code changes to a minimimum while
+ * adapting the existing codebase to start using React.
+ */
+class ToolboxController extends Component {
+  constructor(props, context) {
+    super(props, context);
+
+    // See the ToolboxToolbar propTypes for documentation on each of these items in
+    // state, and for the definitions of the props that are expected to be passed in.
+    this.state = {
+      focusedButton: ELEMENT_PICKER_ID,
+      toolboxButtons: [],
+      visibleToolboxButtonCount: 0,
+      currentToolId: null,
+      highlightedTools: new Set(),
+      panelDefinitions: [],
+      hostTypes: [],
+      currentHostType: undefined,
+      areDockOptionsEnabled: true,
+      canCloseToolbox: true,
+      isSplitConsoleActive: false,
+      disableAutohide: undefined,
+      canRender: false,
+      buttonIds: [],
+      checkedButtonsUpdated: () => {
+        this.forceUpdate();
+      },
+    };
+
+    this.setFocusedButton = this.setFocusedButton.bind(this);
+    this.setToolboxButtons = this.setToolboxButtons.bind(this);
+    this.setCurrentToolId = this.setCurrentToolId.bind(this);
+    this.highlightTool = this.highlightTool.bind(this);
+    this.unhighlightTool = this.unhighlightTool.bind(this);
+    this.setHostTypes = this.setHostTypes.bind(this);
+    this.setCurrentHostType = this.setCurrentHostType.bind(this);
+    this.setDockOptionsEnabled = this.setDockOptionsEnabled.bind(this);
+    this.setCanCloseToolbox = this.setCanCloseToolbox.bind(this);
+    this.setIsSplitConsoleActive = this.setIsSplitConsoleActive.bind(this);
+    this.setDisableAutohide = this.setDisableAutohide.bind(this);
+    this.setCanRender = this.setCanRender.bind(this);
+    this.setPanelDefinitions = this.setPanelDefinitions.bind(this);
+    this.updateButtonIds = this.updateButtonIds.bind(this);
+    this.updateFocusedButton = this.updateFocusedButton.bind(this);
+    this.setDebugTargetData = this.setDebugTargetData.bind(this);
+  }
+
+  shouldComponentUpdate() {
+    return this.state.canRender;
+  }
+
+  componentWillUnmount() {
+    this.state.toolboxButtons.forEach(button => {
+      button.off("updatechecked", this.state.checkedButtonsUpdated);
+    });
+  }
+
+  /**
+   * The button and tab ids must be known in order to be able to focus left and right
+   * using the arrow keys.
+   */
+  updateButtonIds() {
+    const { toolboxButtons, panelDefinitions, canCloseToolbox } = this.state;
+
+    // This is a little gnarly, but go through all of the state and extract the IDs.
+    this.setState({
+      buttonIds: [
+        ...toolboxButtons
+          .filter(btn => btn.isInStartContainer)
+          .map(({ id }) => id),
+        ...panelDefinitions.map(({ id }) => id),
+        ...toolboxButtons
+          .filter(btn => !btn.isInStartContainer)
+          .map(({ id }) => id),
+        canCloseToolbox ? "toolbox-close" : null,
+      ].filter(id => id),
+    });
+
+    this.updateFocusedButton();
+  }
+
+  updateFocusedButton() {
+    this.setFocusedButton(this.state.focusedButton);
+  }
+
+  setFocusedButton(focusedButton) {
+    const { buttonIds } = this.state;
+
+    focusedButton =
+      focusedButton && buttonIds.includes(focusedButton)
+        ? focusedButton
+        : buttonIds[0];
+    if (this.state.focusedButton !== focusedButton) {
+      this.setState({
+        focusedButton,
+      });
+    }
+  }
+
+  setCurrentToolId(currentToolId) {
+    this.setState({ currentToolId }, () => {
+      // Also set the currently focused button to this tool.
+      this.setFocusedButton(currentToolId);
+    });
+  }
+
+  setCanRender() {
+    this.setState({ canRender: true }, this.updateButtonIds);
+  }
+
+  highlightTool(highlightedTool) {
+    const { highlightedTools } = this.state;
+    highlightedTools.add(highlightedTool);
+    this.setState({ highlightedTools });
+  }
+
+  unhighlightTool(id) {
+    const { highlightedTools } = this.state;
+    if (highlightedTools.has(id)) {
+      highlightedTools.delete(id);
+      this.setState({ highlightedTools });
+    }
+  }
+
+  setDockOptionsEnabled(areDockOptionsEnabled) {
+    this.setState({ areDockOptionsEnabled });
+  }
+
+  setHostTypes(hostTypes) {
+    this.setState({ hostTypes });
+  }
+
+  setCurrentHostType(currentHostType) {
+    this.setState({ currentHostType });
+  }
+
+  setCanCloseToolbox(canCloseToolbox) {
+    this.setState({ canCloseToolbox }, this.updateButtonIds);
+  }
+
+  setIsSplitConsoleActive(isSplitConsoleActive) {
+    this.setState({ isSplitConsoleActive });
+  }
+
+  setDisableAutohide(disableAutohide) {
+    this.setState({ disableAutohide });
+  }
+
+  setPanelDefinitions(panelDefinitions) {
+    this.setState({ panelDefinitions }, this.updateButtonIds);
+  }
+
+  get panelDefinitions() {
+    return this.state.panelDefinitions;
+  }
+
+  setToolboxButtons(toolboxButtons) {
+    // Listen for updates of the checked attribute.
+    this.state.toolboxButtons.forEach(button => {
+      button.off("updatechecked", this.state.checkedButtonsUpdated);
+    });
+    toolboxButtons.forEach(button => {
+      button.on("updatechecked", this.state.checkedButtonsUpdated);
+    });
+
+    const visibleToolboxButtonCount = toolboxButtons.filter(
+      button => button.isVisible
+    ).length;
+
+    this.setState(
+      { toolboxButtons, visibleToolboxButtonCount },
+      this.updateButtonIds
+    );
+  }
+
+  setDebugTargetData(data) {
+    this.setState({ debugTargetData: data });
+  }
+
+  render() {
+    return ToolboxToolbar(Object.assign({}, this.props, this.state));
+  }
+}
+
+module.exports = ToolboxController;