[tbb-bugs] #21308 [Applications/Tor Browser]: Fix modernizr breakage for TBB/ESR52

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#21308: Fix modernizr breakage for TBB/ESR52
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 Reporter:  arthuredelstein                  |          Owner:  tbb-team
     Type:  defect                           |         Status:
                                             |  needs_review
 Priority:  Medium                           |      Milestone:
Component:  Applications/Tor Browser         |        Version:
 Severity:  Normal                           |     Resolution:
 Keywords:  ff52-esr, TorBrowserTeam201702R  |  Actual Points:
Parent ID:  #20680                           |         Points:
 Reviewer:                                   |        Sponsor:  Sponsor4
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Comment (by arthuredelstein):

 Replying to [comment:6 mcs]:
 > r=brade, r=mcs
 > This looks good to us. Nice work!
 > We tested with the Modernizr script (using our own little test page) and
 the right thing seemed to happen.

 Thanks for reviewing this! I added a small mochitest to make sure it's
 working correctly.
 https://github.com/arthuredelstein/tor-browser/commit/21308+2
 I will this add patch to the latest #20680 branch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21308#comment:7>
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