Few issues with Ubuntu 12.04

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http://ubuntuforums.org – I've been using Ubuntu 12.04.2 for a couple of months now, and there are few minor issues which are bugging me, and it would be good to have a fix. 1. In Firefox, clicking on a torrent download link does not give me an "Open With Transmission" option. 2. Another Firefox issue, one that I faced in 11.04 as well. Even though in the Preferences->Applications section I've set the preference of what to do with mp3 files as "Always Ask", it never asks me and automatically starts to play the file. 3. Nautilus windows opened from other applications for the purpose of selectin (Hardware)