Thanks to Jiri for sticking around on IRC last night to help debug this.
What we found in the end is that the unity 2d panel sends Firefox a
WM_DELETE_WINDOW client message with an abnormally large timestamp when
closing a maximised Firefox window, using the close button. What happens
inside Firefox (well, inside gdk really) is that it saves the timestamp
of each new event on its GdkDisplay as long as the timestamp is newer
than the previous one. Firefox uses this last event timestamp for
pointer grab handling and drag events. Once Firefox has seen the
timestamp from a long way in the future, this broken timestamp is then
used for all future pointer grabs (which fail because the timestamp is
ahead of the X server time).
After looking at the unity 2d source, it actually sends the system time
(ie, time since the epoch) as the timestamp, rather than the X server
timestamp of the mouse button event.
** Package changed: firefox (Ubuntu) => unity-2d (Ubuntu)
** Changed in: unity-2d (Ubuntu)
Importance: Undecided => Medium
** Changed in: unity-2d (Ubuntu)
Status: Incomplete => Triaged
** Also affects: unity-2d (Ubuntu Oneiric)
Importance: Undecided
Status: New
** Also affects: unity-2d (Ubuntu Precise)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1010466
Title:
dropdown boxes on sites stop working
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