[tbb-bugs] #18080 [Applications/Tor Browser]: Firefox bug - CORS header 'Access-Control-Allow-Origin' missing

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#18080: Firefox bug - CORS header 'Access-Control-Allow-Origin' missing
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 Reporter:  cypherpunks               |          Owner:  tbb-team
     Type:  defect                    |         Status:  needs_information
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-usability-website     |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by cypherpunks):

 My web chat can't reconnect because of this error!
 It appeared right after the HTTPSE update, which was responsible for
 messing with headers in the past (#9481).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18080#comment:15>
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