Description of problem:
Please rename mozilla-firefox.desktop to firefox.desktop. Not only does this match what other distros are doing but it also is used as one of GNOME Shell's default apps as of 3.1.90.
This was changed with this commit:
This bug has been triaged
With the latest gnome-shell (3.1.91), the mozilla-firefox.desktop favorite works (since Epiphany is now default, Fedora has to patch to set Firefox instead). While I'd prefer that Fedora follow the naming convention other distros use, I guess this is just wishlist now.
firefox-7.0.1-2.fc15 has been submitted as an update for Fedora 15.
firefox-7.0.1-2.fc16 has been submitted as an update for Fedora 16.
Fixed in firefox-7.0.1-3.fc17.
shared-mime-info-1.0-4.fc17 has been submitted as an update for Fedora 17.