[tor-bugs] #19520 [Applications/Tor Browser]: Investigate "No last modified time (bug 1000338)" entries visible in about:cache

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#19520: Investigate "No last modified time (bug 1000338)" entries visible in
about:cache
--------------------------------------+--------------------------
 Reporter:  gk                        |          Owner:  tbb-team
     Type:  task                      |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-linkability           |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by bugzilla):

 Why do you think they are not isolated?
 There are a lot of such entries in a cache, e.g.:
 {{{
 Key     Data size       Fetch count     Last Modifed    Expires
 Pinning
 https://pinning-test.badssl.com/        0 bytes         1       No last
 modified time (bug 1000338)     No expiration time
 }}}
 and if you click on it, you'll get
 {{{
 Cache entry information
 The cache entry you selected is not available.
 }}}
 So it's not a bug when entry which isn't available has no metadata,
 including "last modified time". But its presence in a cache list seems to
 be a bug.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19520#comment:1>
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