My FireFox (1.0) went bonkers. One of the themes had some sort of a bug in it, and the browser view broke completely. Menus showed black text on black background, no styles anywhere. I wasn’t able to uninstall the theme because the Theme dialog was all white (With Uninstall, Use, Update texts at the bottom, though). I uninstalled Firefox, re-installed but the uninstall hadn’t apparently deleted the theme files (nor extensions etc., luckily). Then I realized there’s this mysterious Safe Mode below the regular FF. Ah, things in place, at last. I uninstalled most of the themes (most didn’t work anyway because I’d just updated from 1.0PR — or more like installed yet another FF. I realized I had 0.92 and 1.0PR still left, I thought the new versions install over the old ones). When I restarted FF the theme had gone back to default. Phew. Because the uninstall wouldn’t destroy all the files, I didn’t have to re-download loads of extensions (well, some, a few)… Lucky me.