[Bug 1551171]

[flying sheep]

Bug 568218 points out the correct files to use for this: mimeapps.list →
defaults.list, as defined by the mime actions spec
https://specifications.freedesktop.org/mime-apps-spec/latest/

The “Default Applications” section says:
https://specifications.freedesktop.org/mime-apps-
spec/latest/ar01s03.html

> Indicating the default application for a given mimetype is done by writing into the group [Default Applications] in the file mimeapps.list.
> […]
> This example ensures that the application default1.desktop will be used for mimetype1, if it's installed, and otherwise default2.desktop if it's installed:
> 
> [Default Applications]
> mimetype1=default1.desktop;default2.desktop

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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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