Package: firefox Version: 64.0-1 Severity: minor File: /usr/share/man/man1/firefox.1.gz
The man page says
OPTIONS
A summary of the options supported by firefox is included below.
...
Mozilla options
-h, -help
Show summary of options.
Please change that last
Show summary of options.
to
Show all options.
Also are you sure you want to say Mozilla options not Firefox options?
https://bugzilla.mozilla.org/show_bug.cgi?id=1322878
