Cannot download addons, yet all suggestions in help sections not helping! When I originally downloaded FireFox yesterday there were many script errors, so I updated it today but still get different script errors when I try to download any files. Here is one of them: Firefox could not install the file at https://addons.mozilla.org/en-US/firefox/downloads/latest/13990/addon-13990-latest.xpi?src=search because: Download error -228 == This happened == Every time Firefox opened