[Bug 1551171]

[Brent Spillner]

It is still relevant; see for example
https://bugzilla.mozilla.org/show_bug.cgi?id=1304650.
https://wiki.debian.org/MIME has succinct info about the cache file, and
https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/574342/comments/22
describes a workaround.

You could argue that this is a desktop environment bug, but from the
user perspective "the right thing" happens when they open the downloaded
item via their file browser of choice, and changing the default file
association in their desktop environment settings tool doesn't influence
Firefox behavior.  Firefox is the outlier, and ought to be using the
same handler application that xdg-mime would return.

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https://bugs.launchpad.net/bugs/1551171

Title:
  /usr/share/applications/mimeinfo.cache is used for default
  applications in Firefox

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