[tor-bugs] #5279 [TorBrowserButton]: Remove toggle-mode specific request observers

[Tor Bug Tracker & Wiki]

#5279: Remove toggle-mode specific request observers
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 Reporter:  mikeperry         |          Owner:  mikeperry                    
     Type:  enhancement       |         Status:  new                          
 Priority:  major             |      Milestone:  TorBrowserBundle 2.3.x-stable
Component:  TorBrowserButton  |        Version:                               
 Keywords:  MikePerry201211d  |         Parent:                               
   Points:                    |   Actualpoints:                               
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Comment(by mikeperry):

 This should also fix #6661 and potentially a few other related website
 failures.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5279#comment:4>
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