Xephyr bug with Firefox

[Robert Connolly]

Hello.

I use Xephyr with Firefox. I also run Firefox as a dedicated user. At 
seemingly random times, but on a regular basis, Firefox will behave 
oddly. Firefox will open links in a new window, scrolling up or down 
with my touchpad will cause the tab to go forward or backward through 
browser history, and sometimes capslock will be on when typing in 
Firefox, even though capslock is off.

Restarting Firefox does not fix these issues, but restarting Xephyr 
does. These issues typically happen when Firefox has been loaded and 
idle for many hours, although once it happened after only being loaded 
for a few minutes.

I'm guessing this is a memory corruption bug. Could any of you try to 
reproduce this bug, and could any of you suggest some simple ways 
(simple like strace) of debugging this? I would like to have something 
concrete to report to the Xephyr folks so that it gets fixed quickly.

I am running a recent snapshot on an AMD64 with 6GB of memory. I have no 
other problems with other software, so I think I can rule out damaged 
hardware.

Thanks