[tor-bugs] #3944 [Tor bundles/installation]: TBB prefs are set as user_prefs (may cause exceptions/settings errors?)

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#3944: TBB prefs are set as user_prefs (may cause exceptions/settings errors?)
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 Reporter:  mikeperry                 |          Owner:  erinn                        
     Type:  defect                    |         Status:  new                          
 Priority:  normal                    |      Milestone:  TorBrowserBundle 2.2.x-stable
Component:  Tor bundles/installation  |        Version:                               
 Keywords:                            |         Parent:                               
   Points:                            |   Actualpoints:                               
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 All of the prefs we change in TBB appear to be set as user prefs. This
 makes it hard for me in Torbutton to tell if the user has changed a value.

 We also have occasional reports from people that some prefs seem
 inexplicably set (such as form fill options).  Since user_prefs() sets a
 user value, it probably causes Firefox to emit observer events for each
 preference we change in this way. If one of them has an exception because
 the observer for that pref is buggy and/or tries to touch some not-yet-
 initialized piece of Firefox at startup, that could easily cause some
 prefs to fail to apply randomly.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3944>
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