Thanks for the bug report. We have reviewed the information you have provided above, and unfortunately I have to admit it is completely useless to us. This backtrace is meant to be used by the software, which is working only for the binaries from mozilla.org and with tools which are not available to us. Therefore, I have to ask you to collect the same information again using the old-fashioned way. First of all, could we get output of the command rpm -qa *xulrun* *firefox* *mozilla* *flash* *plugin* Please also install firefox-debuginfo (debuginfo-install is from yum-utils package). debuginfo-install firefox Then run firefox with a parameter -g. That will start firefox running inside of gdb debugger. Then use command run and do whatever you did to make firefox crash. When it happens, you should go back to the gdb and run (gdb) thread apply all backtrace This produces usually many screens of the text. Copy all of them into a text editor and attach the file to the bug as an uncompressed attachment. We will review this issue again once you've had a chance to attach this information. Thanks in advance.