Reproducible: Always Steps to Reproduce: 1. Some pages are displayed in 16 tabs. 2. Only one tab is closed. 3. Select Bookmarks --> "Bookmark All Tabs..." Error Console message: 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] Windows XP SP1 Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20060625 Minefield/3.0a1

That's the same cause and cure as bug 342155, not invalidating _browsers after removing one, so you don't need 16. Open a new window, open three tabs, close one, bookmark all tabs won't work. *** This bug has been marked as a duplicate of 342155 ***