[tbb-bugs] #29120 [Applications/Tor Browser]: Default value of media.cache_size (0) causes some media to load extremely slowly or become unplayable

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#29120: Default value of media.cache_size (0) causes some media to load extremely
slowly or become unplayable
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 Reporter:  QZw2aBQoPyuEVXYVlBps                 |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-disk-leak, tbb-usability-        |  Actual Points:
  website, TorBrowserTeam201901                  |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by QZw2aBQoPyuEVXYVlBps):

 Alright, I poked around the code a little more and I think I found a
 decent solution.

 I changed {{{GetMediaCache}}} to add a {{{aIsPrivateBrowsing}}} parameter.
 As far as I can tell, {{{GetMediaCache}}} is only ever called from
 {{{MediaCacheStream::Init}}}, so I just changed the call there to pass in
 the stream's {{{mIsPrivateBrowing}}} member.

 The rest of the code is pretty similar to the previous patch, but the new
 logic only applies in private browsing mode now. I added and updated a few
 comments in the code to reflect the new behavior as well.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29120#comment:13>
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