[Bug 548866] Re: forgets middlemouse.contentLoadURL on upgrade

[Migrus]

The description/title of this only speaks of this happening on update. I
am getting this on every restart of the browser (as described in Bug
#784542, which was set as a duplicate of this). Perhaps the title of
this report should be changed to say restart?

I think from comment 17 that this is known to be on restart and not on
upgrade. But to make sure there is no misunderstanding, here are the
steps I take to reproduce this:

1. Start firefox, enter about:config, set middlemouse.contentLoadURL to true
2. middlemouse-paste a URL to a window, it loads the URL ()
3. Stop firefox, check the 'prefs.js' file:
	$ grep middle prefs.js
	user_pref("middlemouse.contentLoadURL", true);
4. Start firefox, the setting is gone from the about:config and the
   'prefs.js' file:
	$ grep middle prefs.js
	$
5. middlemouse-paste a URL to a window, it does nothing.


I can get this working by disabling the "Ubuntu Firefox Modifications" add-on.

Not sure why that did not work for the reporter of Bug #784542. Possibly that some other setting is in conflict? I normally disable:
browser.tabs.opentabfor.middleclick
middlemouse.openNewWindow

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https://bugs.launchpad.net/bugs/548866

Title:
  forgets middlemouse.contentLoadURL on upgrade