The problem has been solved by updating the drivers of the nvidia graphic card (before I had the 173 version).
The problem can be seen in old graphic cards, for example GeForce FX 5200 in which the 173 version is the last version provided. -- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/38131 Title: Firefox causes massive Xorg CPU usage -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
