Comment 33 for bug 220628

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lessoffensive (lessoffensive) wrote : Re: firefox-3.0b5 received an X Window System error: 'BadIDChoice'

After a large amount of testing and finally correlating logs, I determined this to be caused by installing version 1.3.10a of the flashblock extension though apt. I use amd64, kubuntu intrepid, Kde 4.1 (and 4.2), nvidia drivers, and QtCurve. I think the last two looked like they may have been related, but probably aren't.

1.3.10a in the repositories is too old; I switched to version 1.5.7.1 from addons.mozilla.org and my problems have finally resolved.

Lesson: don't install Firefox extensions from apt.