[tbb-bugs] #29705 [Applications/Tor Browser]: Enable Brotli compression for .onion domains

[Tor Bug Tracker & Wiki]

#29705: Enable Brotli compression for .onion domains
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 Reporter:  expyuzz4wqqyqhjn  |          Owner:  tbb-team
     Type:  defect            |         Status:  new
 Priority:  Medium            |      Component:  Applications/Tor Browser
  Version:                    |       Severity:  Normal
 Keywords:                    |  Actual Points:
Parent ID:                    |         Points:
 Reviewer:                    |        Sponsor:
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 Tor Browser treats .onion as secure domains. Brotli compression is only
 enabled in Firefox on secure domains, but not for .onion domains.

 Internally, Firefox controls these from the following settings:
 network.http.accept-encoding
 network.http.accept-encoding.secure

 .onion is treated as the first instance (insecure) and only enable gzip
 and deflate. It should be handled as the second category and thus also
 enable Brotli compression.

 Brotli compression will be beneficial to .onion service performance and
 reducing the data usage of Tor Browser.

 PS: The requirement for Brotli to only be used on secure connections was a
 political decision by Google who wanted to use their new efficient
 compression method as a carrot to encourage HTTPS adoption.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29705>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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