[Bug 1491969] [NEW] Search extensions from addons.mozilla.org can't be installed

[Nathan Dorfman]

Public bug reported:

This seems to be a bug in the Ubuntu version of Firefox -- started with
a Mozilla ticket here
https://bugzilla.mozilla.org/show_bug.cgi?id=1166508

The short version is that search extensions from addons.mozilla.org fail
to install with the error "Sorry, you need a Mozilla-based browser (such
as Firefox) to install a search plugin." This can be observed either by
navigating directly to, e.g., https://addons.mozilla.org/en-
US/firefox/addon/wolfram-alpha-searchextension/ OR by going to
Preferences | Search | Add more search engines... in the Firefox menu.

I just got a chance to try this immediately after a fresh install of
14.04.3 x64 desktop, fresh /home and everything, and got the same error.
So, it seems to clearly be an Ubuntu bug. However, deleting the
preinstalled plugins in /usr/lib/mozilla/plugins/ doesn't work around
the issue. The only thing that does is restarting in safe mode (via the
Firefox help menu).

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

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Title:
  Search extensions from addons.mozilla.org can't be installed

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