the thunderbird build is missing the default component xmlextras. The forumzilla extension requires this component to function. (It's possible other extensions may require this component, or other components that were recently removed.) Reproducible: Always Steps to Reproduce: 1. Emerge mozilla-thunderbird 2. Run thunderbird and install forumzilla.xpi 3. Restart thunderbird 4. Check javascript console for errors due to missing components Actual Results: Error: XMLSerializer is not defined Source File: chrome://forumzilla/content/global.js Line: 53 Error: appDirectoryService has no properties Source File: chrome://forumzilla/content/FeedService.js Line: 285 Expected Results: No errors. This same problem as in http://bugs.gentoo.org/show_bug.cgi?id=60060 except for a different component. To fix, just add "xmlextras" back into the thunderbird section in mozilla.eclass. Users may need to re-install the plug-in after emerging a fix because of cached files in their profile directory. Paul.
Stale bug, reopen if this is still an issue with up-to-date ebuild versions.