[tbb-bugs] #13301 [Tor Browser]: Update from 4.0-alpha-2 to 4.0-alpha-3 told me all my extensions were incompatible

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#13301: Update from 4.0-alpha-2 to 4.0-alpha-3 told me all my extensions were
incompatible
-------------------------+--------------------------
 Reporter:  arma         |          Owner:  tbb-team
     Type:  defect       |         Status:  new
 Priority:  normal       |      Milestone:
Component:  Tor Browser  |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
-------------------------+--------------------------
 My TBB 4.0-alpha-2 (32-bit Linux) popped up a thing saying there was an
 update ready. I said 'ok get it'. A while later it popped up a window with
 the title "Software Update" which said that the following extensions were
 incompatible with this new version, and they would be disabled until they
 were fixed to be compatible: Torbutton, Tor Launcher, HTTPS Everywhere.

 My network here is really crappy -- is it possible there's some "try to
 reach the thing to check compatibility, if you time out, assume they're
 not compatible" logic somewhere?

 (I'm assuming that the extensions do indeed self-identify as being
 compatible with all TBB 4.x.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13301>
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