diff --git a/mozilla/toolkit/content/widgets/tabbrowser.xml b/mozilla/toolkit/content/widgets/tabbrowser.xml
index a4a47fb2cbf..0864778a5ca 100644
--- a/mozilla/toolkit/content/widgets/tabbrowser.xml
+++ b/mozilla/toolkit/content/widgets/tabbrowser.xml
@@ -2279,7 +2279,7 @@
}
this._updateDisableBackgroundClose();
- pb2.addObserver("browser.tabs.disableBackgroundClose", this, false);
+ pb2.addObserver("browser.tabs.disableBackgroundClose", this, true);
var self = this;
function onResize() {
@@ -2288,13 +2288,6 @@
window.addEventListener("resize", onResize, false);
-
- var pb2 =
- Components.classes["@mozilla.org/preferences-service;1"].
- getService(Components.interfaces.nsIPrefBranch2);
- pb2.removeObserver("browser.tabs.disableBackgroundClose", this);
-
-