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-rw-r--r--browser/modules/TransientPrefs.jsm24
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diff --git a/browser/modules/TransientPrefs.jsm b/browser/modules/TransientPrefs.jsm
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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";
+
+this.EXPORTED_SYMBOLS = ["TransientPrefs"];
+
+Components.utils.import("resource://gre/modules/Preferences.jsm");
+
+var prefVisibility = new Map;
+
+/* Use for preferences that should only be visible when they've been modified.
+ When reset to their default state, they remain visible until restarting the
+ application. */
+
+this.TransientPrefs = {
+ prefShouldBeVisible: function (prefName) {
+ if (Preferences.isSet(prefName))
+ prefVisibility.set(prefName, true);
+
+ return !!prefVisibility.get(prefName);
+ }
+};