After uninstalling Swfdec and put proprietary Flash 10 plugin, it works well, but it needs last version of Flash 10, I read that old version, in addition to a security risk, could also cause this crash.
http://labs.adobe.com/downloads/flashplayer10.html Download the tar.gz file. Go to .Mozilla in your home and create a new folder "plugins". Extract libflashplayer.so inside and restart Firefox. I hope it can help. -- [MASTER] Gdk-ERROR **: The program 'firefox-3.5' received an X Window System error (BadWindow) https://bugs.launchpad.net/bugs/401055 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs