This sounds very much like an old XGL bug. What version of Ubuntu are
you using, and are you using the xserver-xgl package?
Also, your description of the bug suggests that it's not a firefox bug;
I'm removing the assignment to the "firefox" package.
** Changed in: Ubuntu
Sourcepackagename: firefox => None
Assignee: (unassigned) => Chris Halse Rogers
Status: Unconfirmed => Needs Info
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shift+backspace causes ubuntu to crash and log out.
https://bugs.launchpad.net/bugs/116738
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