[tor-bugs] #4718 [TorBrowserButton]: Perform versioncheck periodically in background

[Tor Bug Tracker & Wiki]

#4718: Perform versioncheck periodically in background
------------------------------+---------------------------------------------
 Reporter:  mikeperry         |          Owner:  mikeperry                    
     Type:  enhancement       |         Status:  new                          
 Priority:  major             |      Milestone:  TorBrowserBundle 2.2.x-stable
Component:  TorBrowserButton  |        Version:                               
 Keywords:                    |         Parent:                               
   Points:                    |   Actualpoints:                               
------------------------------+---------------------------------------------
 Torbutton should perform an async XMLHTTPRequest TBB version check
 periodically, so that new windows show an updated Tor check status
 message.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4718>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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