This is reproducible on both SuSE 11 machines I run, in Gnome, KDE3, and KDE4, with and without NVidia drivers installed: when I open a new Firefox window, my homepage, and every page I open in that tab, will be broken. I submitted a bug to Mozilla (https://bugzilla.mozilla.org/show_bug.cgi?id=449993) and tried to submit for SuSE but my login kept taking me in circles.
yep, turned out it was the tor button. Funny it doesn’t do this on every OS, just SuSE 11. Ubuntu, WinXP, and OS X are fine. Thanks for the back-to-the-basics reminder.