[Bug 1407174] [NEW] Firefox claims to be not the default browser while x-www-browser opens it

[Sworddragon]

Public bug reported:

I'm using Ubuntu 15.04 dev with firefox 34.0+build2-0ubuntu2 and if I'm
going to the menu bar -> Edit -> Preferences -> General there stands
"Firefox is not your default browser". But if I'm executing x-www-
browser in a terminal Firefox does successfully start.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Firefox claims to be not the default browser while x-www-browser opens
  it

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