are you on feisty? can you please try to upgrade firefox to 2.0.0.3 and
see if this is gone away?
** Changed in: firefox (Ubuntu)
Importance: Undecided => Medium
Status: Unconfirmed => Needs Info
** Changed in: firefox (Ubuntu)
Assignee: (unassigned) => Alexander Sack
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https is broken
https://launchpad.net/bugs/96447