265906 - nsIObserverService::removeObserver fails at browser.js::Shutdown

Status: VERIFIED DUPLICATE of bug 283116

(Firefox :: General, defect)

Description

[Jesse Ruderman]

I've been seeing this error a lot:

Error: uncaught exception: [Exception... "Component returned failure code:
0x80004005 (NS_ERROR_FAILURE) [nsIObserverService.removeObserver]"  nsresult:
"0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame ::
chrome://browser/content/browser.js :: Shutdown :: line 832"  data: no]

Line 832 is

os.removeObserver(gBrowser.browsers[0], "browser:purge-session-history");

More removeObserver lines follow, which I think means this could cause memory leaks.

I'm using a build between 10/22 and 10/23.  I'm using the following extensions:
Thumbs, Search Keys, Favicon Picker, Delicious Delicacies, MILTON Integration.

Comment 1

[Michael Kraft [:morac]]

The exception is being thrown by this line:

  os.removeObserver(gBrowser.browsers[0], "browser:purge-session-history");

Strangely enough, the first few lines in the Shutdown function are the only ones
that don't have a try catch around them.  Looks like they should.

I've got a surefire way of getting this exception.

Steps:

1. Create a new profile (to rule out extensions)
2. Start Firefox (window will open).
3. Open javascript console
4. Open new tab.
5. Right click on newly created tab and click close other tabs.
6. Click the close tabs button when the prompt comes up.
7. Close browser window
8. Look in javascript console for error which always occurs either on step #6 or
#7 above.

Comment 2

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Forgot this was filed

*** This bug has been marked as a duplicate of 283116 ***

Comment 3

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

(And I really should have fixed this for 1.0; too bad I didn't notice the
bugmail at the time...)