None of the question related, solved my problem, first, I don't use windows; second, questions related are from years ago, nad seems outadted, because much of that questions suggest to change the values of network.protocol-handler.external.magnet, but in Iceweasel 29 I can't find anything similar., should I create it? What kind of value is, boolean, string.?

I don't have it some clear, or at least in your support is not clear at all. And this link which is recommended in some relates questions: is broken, at least to me is broken.

The real problem is when I download files like.torrent that as soon as are downloaded need the torrent client to start (torrent client that doesn't start because for firefox the.torrent download is never completed). I tried disabling the antivirus (bitdefender) but the problem persisted. In Chrome downloads work fine (also with antivirus. How can I get Firefox to open torrent files with Transmission? Ask Question 13. Every time I download a torrent file (.torrent), Firefox thinks I should open it with a text editor. How can I get it to open with Transmission? In Ubuntu 13.04 I cannot get Firefox to open.torrent files by default.