OpenGL log file (MESA)

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http://askubuntu.com – Recently my firefox started to freeze I have a strong feeling that it has to do something with opengl, but I can't prove it, because I can't find any opengl or mesa log file. And yes I looked at /var/log/syslog and /var/log/Xorg.0.log.old but except backtrace I wasn't able to find anything else about the error. Where can I find some log files that logs everything graphics related? (HowTos)