Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8b2) Gecko/20050404 Firefox/1.0+ If you have multiple tabs open, and close more than one of them quickly (using the holding down the keyboard shortcut for instance,) several errors appear in the JavaScript Console. Reproducible: Always Steps to reproduce: 0. Have javascript.options.showInConsole set to true. Open up the JavaScript Console (Tools > JavaScript Console) and Clear all the errors. 1. Open up multiple tabs (8 or more is good, preferably with about:blank loaded in each.) 2. Hold down the keyboard shortcut for 'Close Tab' (found in File > Close Tab.) 3. Open up the JavaScript Console (Tools > JavaScript Console,) and go to Errors. Actual Results: JavaScript Console showed multiple errors. Expected Results: JavaScript Console should not have shown any errors. The error was: Error: uncaught exception: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMXULElement.boxObject]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://global/content/bindings/browser.xml :: get_docShell :: line 0" data: no]

I've seen this on windows XP on a recent trunk build, so marking platform all. I thought maybe it had something to do with session restore, but this bug is from 2005-04-04, which is way before dietrich's work. see also: https://bugzilla.mozilla.org/show_bug.cgi?id=318168#c19 and https://bugzilla.mozilla.org/show_bug.cgi?id=318168#c33 for some related information about this error.

Can you still reproduce this issue? I can't in Firefox 3.5.3, which is what I have open currently...

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.3a1pre) Gecko/20090913 Minefield/3.7a1pre I don't see this now.