Same thing happens to me in Firefox 3.5.1. Konqueror is unaffected and full screens YouTube videos without freezing.
Ubuntu 9.04 / KDE 4.2.2 Linux 2.6.28-13-generic #45-Ubuntu SMP Tue Jun 30 22:12:12 UTC 2009 x86_64 GNU/Linux GeForce 7300 GT with nvidia-glx-180 driver As a temporary solution: Right click on the video and go to Settings... then uncheck Enable hardware acceleration. -- Firefox freezes when trying to view fullscreen flash video https://bugs.launchpad.net/bugs/346717 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