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diff --git a/devtools/client/performance-new/components/shared/ProfilerPreferenceObserver.js b/devtools/client/performance-new/components/shared/ProfilerPreferenceObserver.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/. */
+// @ts-check
+
+/**
+ * @template P
+ * @typedef {import("react-redux").ResolveThunks<P>} ResolveThunks<P>
+ */
+
+/**
+ * @typedef {import("../../@types/perf").State} StoreState
+ */
+
+/**
+ * @typedef {Object} StateProps
+ * @property {import("../../@types/perf").RecordingSettings} recordingSettingsFromRedux
+ * @property {import("../../@types/perf").PageContext} pageContext
+ * @property {string[]} supportedFeatures
+ */
+
+/**
+ * @typedef {Object} ThunkDispatchProps
+ * @property {typeof actions.updateSettingsFromPreferences} updateSettingsFromPreferences
+ */
+
+/**
+ * @typedef {ResolveThunks<ThunkDispatchProps>} DispatchProps
+ * @typedef {StateProps & DispatchProps} Props
+ */
+
+"use strict";
+
+// These functions live in a JSM file so that this can be used both by this
+// CommonJS DevTools environment and the popup which isn't in such a context.
+const {
+ getRecordingSettings,
+ setRecordingSettings,
+ addPrefObserver,
+ removePrefObserver,
+} = ChromeUtils.import(
+ "resource://devtools/client/performance-new/shared/background.jsm.js"
+);
+const {
+ PureComponent,
+} = require("resource://devtools/client/shared/vendor/react.js");
+const {
+ connect,
+} = require("resource://devtools/client/shared/vendor/react-redux.js");
+
+const selectors = require("resource://devtools/client/performance-new/store/selectors.js");
+const actions = require("resource://devtools/client/performance-new/store/actions.js");
+
+/**
+ * This component mirrors the settings in the redux store and the preferences in
+ * Firefox.
+ *
+ * @extends {React.PureComponent<Props>}
+ */
+class ProfilerPreferenceObserver extends PureComponent {
+ componentDidMount() {
+ this._updateSettingsFromPreferences();
+ addPrefObserver(this._updateSettingsFromPreferences);
+ }
+
+ componentDidUpdate() {
+ const { recordingSettingsFromRedux, pageContext } = this.props;
+ setRecordingSettings(pageContext, recordingSettingsFromRedux);
+ }
+
+ componentWillUnmount() {
+ removePrefObserver(this._updateSettingsFromPreferences);
+ }
+
+ _updateSettingsFromPreferences = () => {
+ const { updateSettingsFromPreferences, pageContext, supportedFeatures } =
+ this.props;
+
+ const recordingSettingsFromPrefs = getRecordingSettings(
+ pageContext,
+ supportedFeatures
+ );
+ updateSettingsFromPreferences(recordingSettingsFromPrefs);
+ };
+
+ render() {
+ return null;
+ }
+}
+
+/**
+ * @param {StoreState} state
+ * @returns {StateProps}
+ */
+function mapStateToProps(state) {
+ return {
+ recordingSettingsFromRedux: selectors.getRecordingSettings(state),
+ pageContext: selectors.getPageContext(state),
+ supportedFeatures: selectors.getSupportedFeatures(state),
+ };
+}
+
+const mapDispatchToProps = {
+ updateSettingsFromPreferences: actions.updateSettingsFromPreferences,
+};
+
+module.exports = connect(
+ mapStateToProps,
+ mapDispatchToProps
+)(ProfilerPreferenceObserver);