Comment 6 for bug 257483

User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1) Gecko/20090616 Firefox/3.5
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1) Gecko/20090616 Firefox/3.5

The first time I ran FF3.5 RC, it crashed and I got the following console output:

The program 'firefox-bin' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
  (Details: serial 681 error_code 3 request_code 20 minor_code 0)
  (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.)

Reproducible: Always

Steps to Reproduce:
1. Start FF3.5 after using latest 3.0.x release
2. Observe crash
Actual Results:
Crash.

Expected Results:
No crash.

This started happening with the last beta release.