[tor-bugs] #18195 [Tor Browser]: Add a flag to identify Tor Browser in JS

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#18195: Add a flag to identify Tor Browser in JS
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     Reporter:  pento        |      Owner:  tbb-team
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Tor Browser  |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 When Tor Browser visits a WordPress site, they'll see canvas image data
 warning, as WordPress tries to detect if the current browser is capable of
 rendering emoji.

 We can disable this test in Tor Browser, but we need a consistent method
 for testing that we're definitely in the Tor Browser. I don't believe such
 a flag would present a privacy issue, as it's already possible to detect
 if the user is coming from a Tor exit node with the Tor Browser's UA, but
 this method doesn't lend itself to WordPress' needs.

 See further discussion on the WordPress ticket:
 https://core.trac.wordpress.org/ticket/32138

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18195>
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