1 files changed, 65 insertions, 0 deletions
diff --git a/browser/extensions/pictureinpicture/experiment-apis/aboutConfigPipPrefs.js b/browser/extensions/pictureinpicture/experiment-apis/aboutConfigPipPrefs.js
new file mode 100644
index 0000000000..0d7e15de05
--- /dev/null
+++ b/browser/extensions/pictureinpicture/experiment-apis/aboutConfigPipPrefs.js
@@ -0,0 +1,65 @@
+/* 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";
+
+/* global ExtensionAPI, ExtensionCommon, Services, XPCOMUtils */
+
+/**
+ * Class extending the ExtensionAPI, ensures we can set/get preferences
+ */
+this.aboutConfigPipPrefs = class extends ExtensionAPI {
+  /**
+   * Override ExtensionAPI with PiP override's specific preference API, prefixed by `disabled_picture_in_picture_overrides`
+   * @param {ExtensionContext} context the context of an extension
+   * @returns {Object} returns the necessary API structure required to manage prefs within this extension
+   */
+  getAPI(context) {
+    const EventManager = ExtensionCommon.EventManager;
+    const extensionIDBase = context.extension.id.split("@")[0];
+    const extensionPrefNameBase = `extensions.${extensionIDBase}.`;
+
+    return {
+      aboutConfigPipPrefs: {
+        onPrefChange: new EventManager({
+          context,
+          name: "aboutConfigPipPrefs.onSiteOverridesPrefChange",
+          register: (fire, name) => {
+            const prefName = `${extensionPrefNameBase}${name}`;
+            const callback = () => {
+              fire.async(name).catch(() => {}); // ignore Message Manager disconnects
+            };
+            Services.prefs.addObserver(prefName, callback);
+            return () => {
+              Services.prefs.removeObserver(prefName, callback);
+            };
+          },
+        }).api(),
+        /**
+         * Calls `Services.prefs.getBoolPref` to get a preference
+         * @param {String} name The name of the preference to get; will be prefixed with this extension's branch
+         * @returns the preference, or undefined
+         */
+        async getPref(name) {
+          try {
+            return Services.prefs.getBoolPref(
+              `${extensionPrefNameBase}${name}`
+            );
+          } catch (_) {
+            return undefined;
+          }
+        },
+
+        /**
+         * Calls `Services.prefs.setBoolPref` to set a preference
+         * @param {String} name the name of the preference to set; will be prefixed with this extension's branch
+         * @param {String} value the bool value to save in the pref
+         */
+        async setPref(name, value) {
+          Services.prefs.setBoolPref(`${extensionPrefNameBase}${name}`, value);
+        },
+      },
+    };
+  }
+};