I continue to have issues with getting Firefox 15 to properly remember what apps to use to open items with. I'd written previously regarding properly associating .deb files, and the suggested solution sort of works, but at this point Firefox doesn't want to properly "remember" the "other" selection that I've chosen.
See the screenshot below, where I've chosen Azureus; however, Firefox won't allow me to "Do this automatically from now on." If I click OK here, Azureus/Vuze opens, but the next time I click on a .torrent link I will be back to the same issue. I wondered whether my profile is corrupt and created a new one, but am having the same issue.