The default firefox profile directory now no longer ends in `.default`
but instead `.default-release`. For backwards compat the new regex
supports both. For more information see:
https://support.mozilla.org/bm/questions/1264072#answer-1235567
It's possible we might want to also support things like
`.default-nightly`, etc but really if we want to do more than grab
the default profile we should read the `profiles.ini` file to get
an itemized list of profiles from Firefox itself. This would also
future-proof this script.
Since profiles are not generally used by most Firefox users just going
for the simpler solution of looking for `.default-release`.
Security Curious
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