I had a theme installed, and it was open-source. So I renamed it to a ZIP, opened it up, and edited one of the graphics. Then renamed it back to an XPI file. But when I opened up Firefox, it came out a bunch of garbage, at the top of the screen was just a bunch of icons. So I got into safe mode and uninstalled it and now it's working again. Any ideas what I did wrong? My guess is that the ZIP file was the wrong type.