[tor-bugs] #16485 [Applications/Tor Browser]: Firefox bug - Unrecognized storage name 'null' in about:cache URL (was: about:cache does not show anything in Tor Browser based on ESR 38)

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#16485: Firefox bug - Unrecognized storage name 'null' in about:cache URL
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 Reporter:  gk                        |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-usability             |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by bugzilla):

 Replying to [ticket:16485 gk]:
 > Opening `about:cache` does not show any entries.
 It's good. But not all entries are `Private`, even `Anonymous` ;)
 > The reason seems to be that `Private` is unchecked. Doing that and
 trying to update the cache is resulting in an error:
 > {{{
 > Unrecognized storage name 'null' in about:cache URL
 > }}}
 That's because URL is `about:cache?storage=null&context=p,`. `Update`
 works if it's not disabled by NoScript.
 > This is actually a Mozilla bug as this happens in a vanilla Firefox as
 well. But now clicking on `Back to overview` does give us the cache
 entries as `Private` is checked.
 Hmm, still an issue for ESR45, but not so easy reproducible.
 STR was found for blocked by NoScript page: check `Private`, allow page
 and get `about:cache?storage=null&context=`.
 So, it seems only users with weird NoScript config, like in TBB, are
 affected, because Mozilla knows nothing about it. But the only one ticket
 with "Unrecognized storage" is great:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1074485.
 As this ticket is about usability: `about:config` is neither usable, nor
 reliable, e.g. bugs 469677, 633747, 927919, etc.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16485#comment:2>
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