[tor-bugs] #16269 [meek]: add-on compatibility check occurs repeatedly

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#16269: add-on compatibility check occurs repeatedly
--------------------+---------------------
 Reporter:  mcs     |          Owner:  dcf
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:
Component:  meek    |        Version:
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
--------------------+---------------------
 This is a spinoff of ticket #16014.  Georg noticed that after he updated
 Tor Browser 4.5a5 to 5.0a1, he saw a "Checking Compatibility of Add-ons"
 window each time he started the browser.  Kathy and I debugged this and
 found that this window is coming from the meek helper browser.  It shows
 up repeatedly because the prefs.js file is not being written to the
 profile (presumably because the meek browser is killed and does not exit
 in a clean manner).

 One way to fix this is to add code to the meek HTTP helper extension that
 flushes the browser prefs. to disk before it enters the blocking event
 loop.  There may be a better solution, but this seems to solve the
 problem.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16269>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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