See https://www.mozilla.org/en-US/firefox/79.0/releasenotes/
Fixes https://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
add a jumbo patch trying to fix the 'open with' MIME handling mess,
broken since glib 2.64 upgrade - gio-launch-desktop has been replaced by
/bin/sh (see https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1362/)
which is not unveiled. xdg-open calls gio which calls
g_app_info_launch_uris() which now fails.
Try to replace this fragile contraption with simpler (?) plain glib
code directly spawning a previously unveiled mime handler. Rewrite
README section wrt this new handling.
WORKSFORME, havent got much feedback on the patch sadly, and the
developer who wrote the unveil() integration is MIA...
cc5438d91e