I've marked Bug #576082 as a duplicate of this report.
Just checked ~/.xsession-errors.old and found:
The program 'seamonkey-2.0-bin' received an X Window System error.
This probably reflects a bug in the program.
The error was 'RenderBadPicture (invalid Picture parameter)'.
(Details: serial 4062166 error_code 173 request_code 152 minor_code 7)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
deliver mode: 0
$ apt-cache policy xulrunner-1.9.2
xulrunner-1.9.2:
Installed: 1.9.2.3+nobinonly-0ubuntu2
Candidate: 1.9.2.3+nobinonly-0ubuntu2
Version table:
*** 1.9.2.3+nobinonly-0ubuntu2 0
500 http://archive.ubuntu.com/ubuntu/ lucid/main Packages
100 /var/lib/dpkg/status
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seamonkey 2.0 in Lucid crashes with 'RenderBadPicture' diagnostics
https://bugs.launchpad.net/bugs/575160
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