community/firefox: security upgrade to 78.0
pending CVE submission
Removed flags: https://bugzilla.mozilla.org/show_bug.cgi?id=1638195#c1
At 17.00 UTC, gitlab will be upgraded and briefly unavailable.
pending CVE submission
Removed flags: https://bugzilla.mozilla.org/show_bug.cgi?id=1638195#c1