I have the same problem on the Edgy version of firefox, which is Beta 2. I'll go to a site with flash on it, such as espn.com, and it will hang until killed when I'm running the debugger, but will usually just crash automatically when not running the debugger.
** Attachment added: "gdb backtrace file" http://librarian.launchpad.net/4703567/gdb-firefox.txt -- firefox hangs with flash plugin installed on certain sites https://launchpad.net/bugs/302 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs