[tor-bugs] #21923 [Applications/Tor Browser]: Allowing only HTTPS JavaScript on the medium security slider level is broken

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#21923: Allowing only HTTPS JavaScript on the medium security slider level is
broken
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Critical                             |     Resolution:
 Keywords:  noscript, tbb-usability-website,     |  Actual Points:
  ff52-esr, TorBrowserTeam201704R                |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by cypherpunks):

 Replying to [comment:9 ma1]:
 > Replying to [comment:8 cypherpunks]:
 >
 > > Didn't you guess? ;-)
 > > From your URL it failed with [...]
 > > From AMO - works.
 >
 > No, I didn't and couldn't guess: those XPI files are identical (I
 sinchronize them as soon as they're signed by AMO) and they both install
 fine on a stable Firefox. Weird.
 Well, it was 'Temporary load add-on for debugging' feature :)
 > But, can you verify the bug reported here is fixed?
 Hmm, how to say? Testing revealed:
 1. https://check.torproject.org/?lang=en_US now is loading forever with no
 success (e10s), or there is OCSP failure (non-e10s).
 2. reloading youtube after high->medium gives no svg, etc (not noscript-
 related?), second reloading works.
 3. video is behind placeholder which allows video/mse, after clicking,
 reloading leads to error on video, because audio/mse is blocked (but no
 placeholder).
 4. seems it was ad video, because after enabling audio/mse from menu,
 there is an error again, because video/mse was blocked (but no placeholder
 again).
 5. strong feeling that that's not all ;)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21923#comment:10>
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