diff --git a/toolkit/components/places/tests/autocomplete/test_tabmatches.js b/toolkit/components/places/tests/autocomplete/test_tabmatches.js
index ef895c79a36..a7eabc6da17 100644
--- a/toolkit/components/places/tests/autocomplete/test_tabmatches.js
+++ b/toolkit/components/places/tests/autocomplete/test_tabmatches.js
@@ -4,7 +4,11 @@
  * 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/. */
 
-let gTabRestrictChar = prefs.getCharPref("browser.urlbar.restrict.openpage");
+let gTabRestrictChar = "%";
+prefs.setCharPref("browser.urlbar.restrict.openpage", gTabRestrictChar);
+do_register_cleanup(() => {
+  prefs.clearUserPref("browser.urlbar.restrict.openpage");
+});
 
 let kSearchParam = "enable-actions";
 
diff --git a/toolkit/components/places/tests/autocomplete/xpcshell.ini b/toolkit/components/places/tests/autocomplete/xpcshell.ini
index 69dd26c35ad..7c018dbcc7b 100644
--- a/toolkit/components/places/tests/autocomplete/xpcshell.ini
+++ b/toolkit/components/places/tests/autocomplete/xpcshell.ini
@@ -1,7 +1,6 @@
 [DEFAULT]
 head = head_autocomplete.js
 tail = 
-firefox-appdir = browser
 skip-if = toolkit == 'android' || toolkit == 'gonk'
 
 [test_416211.js]