Update: using nVidia's proprietary driver (nvidia-glx package) "fixes" the problem. Strangely enough, the only affected application is firefox...
I've also tested Mozilla's "official" firefox2 release and it also has the same problem. -- Strange artifacts in text fields within web applications when moving cursor with keyboard https://launchpad.net/bugs/50768 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
