Public bug reported:

Test case: visit Mycroft Project site, attempt to install search engine
plugin. Installation fails, redirects to
http://mycroft.mozdev.org/jsreq.html ("JavaScript must be enabled to
install a search plugin. If you have installed NoScript, you will need
to allow this page to run scripts.")

Browser is Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:18.0)
Gecko/20100101 Firefox/18.0 -- Firefox 18.0b4 from mozillateam-firefox-
next PPA.

NoScript is installed, but .*\.mozdev\.org is whitelisted. Ghostery is
blocking two trackers, but is not a factor. (Site still fails with
Ghostery disabled.) ABP is enabled, but not blocking any content.

Error console content:

TypeError: this._mainWindow.gBrowser is undefined Source file:
resource://unity/observer.js

Solution:

apt-get purge libufe-xidgetter0 xul-ext-ubufox xul-ext-unity xul-ext-
websites-integration

(Not sure which package is related to resource://unity/observer.js , but
assume it's xul-ext-unity || xul-ext-websites-integration)

Mycroft Project site can now install search engine plugins.

** Affects: unity-firefox-extension (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1091288

Title:
  Ubuntu Firefox addons breaking JS for some sites

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