I was setting up some default .desktop files and happened to come across one titled, userapp-Firefox-MURSKY.desktop, which contained the following:

[Desktop Entry]
Exec=/usr/bin/x-www-browser %u
Comment=Custom definition for Firefox

The file x-www-browser has a note in the beginning:

Firefox launcher containing a Profile migration helper for temporary profiles used during alpha and beta phases.

Does anyone have any idea where this came from?

I am running Ubuntu Gnome 14.04


x-www-browser refers to the default system browser set by the Debian Alternatives System (which is a fancy word for a system that basically symlinks default application names like x-www-browser to actual programs). By default, this is supposed to be symlinked to Firefox.

%u suggests it is supposed to receive a URL as an argument. Thus this .desktop file appears to be intended for opening some specific URL.

As for the file itself and where it came from, that's a bit of a mystery. I have not found anything via google searches. You could delete the file if you're concerned for security, as it is merely a .desktop file, aka program shortcut and not an actual program itself. I would suggest you ask on the Firefox/Mozilla forum as well.

  • Thanks. I will ask on the Mozilla forum also. Just curious about it. I will post if I find anything out about it. – Lee Aug 22 '16 at 2:12
  • 1
    Well, we couldn't find out exactly what the file was but it "seems" to have been used for testing. I am going to back it up and delete it from my system. I may try to investigate it further ... just curious, you know. Thanks again for the help. – Lee Aug 23 '16 at 3:15
  • @Lee what did it intend to test ? – Sergiy Kolodyazhnyy Aug 23 '16 at 3:21
  • It looks like it was for testing Firefox during alpha and beta phases. I'm going to back it up and then delete it. In case you're interested, here is the link where we discussed it – Lee Aug 23 '16 at 22:43

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