Thanks for your bug. What version of Ubuntu do you use. Please don't copy strace logs to comment they are usually useless and doesn't make easy to browse the page or read the bug. Do you have a /usr/lib /mozilla-firefox/components/compreg.dat? If you have it, does moving it away fixes the issue? That might be a duplicate of bug #30791
** Changed in: yelp (Ubuntu) Assignee: (unassigned) => Ubuntu Desktop Bugs Status: Unconfirmed => Needs Info -- Yelp don't working, it just don't start at all https://launchpad.net/bugs/50105 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs