Comment 11 for bug 186432

Ouch, you're right. That's something I noticed some days ago when an extension UI has both a tab and tooltips... I suspect a memory management issue, but it's a bit deep in the code. Anyway, I've stopped adding tooltips as soon as I noticed the bug and thus the other extensions should not be affected.

In this case, the tooltips are not critical (the tab is more useful), and you can remove them completely to prevent the extension from crashing.