Created attachment 311189 [details] stack Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9b5pre) Gecko/2008032119 Firefox/3.0b5pre ID:2008032119 Steps to reproduce: -> Install the PDF Download Extension https://addons.mozilla.org/en-US/firefox/addon/636 -> Open the Options of this Extension -> Click on "Check for updates" -> Close Firefox with the PDF Download Options Window --> Assertion ###!!! ASSERTION: Event listener manager hash not empty at shutdown!: 'sEventListenerManagersHash.entryCount == 0', file /debug/mozilla/content/base/src/nsContentUtils.cpp, line 815
(In reply to comment #0) This bug has been solved by the patch provided here: https://bugzilla.mozilla.org/show_bug.cgi?id=424593 Cheers.
Resolving as FIXED based on Comment 1.