I have the same problem.
** Changed in: firefox-3.0 (Ubuntu)
Status: New = Confirmed
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Firefox crashes on Google Main tab close
https://bugs.launchpad.net/bugs/240264
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Bugs, which is subscribed to Ubuntu.
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** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/15339826/Dependencies.txt
** Attachment added: ExtensionSummary.txt
http://launchpadlibrarian.net/15339827/ExtensionSummary.txt
** Attachment added: profiles.ini.txt
