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

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#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:                    |         Parent:                               
   Points:                    |   Actualpoints:                               
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 There might be a fair amount of performance overhead wrapped up in the
 multiple request observers in Torbutton. Many of these exist only because
 of hacks needed to safely support toggling and plugin-blocking. We can
 probably improve performance quite a bit by removing them.

 Doing so would mean we'd have to more aggressively deprecate Torbutton
 (#3838), which blocks on an autoupdater.

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