1) Beats me. I've tried to find this out in the past and all I can say
is that it doesn't seem to be either a Firefox or a bash option.

2) You can find a (slightly out of date) list of Firefox command line
options at

https://developer.mozilla.org/En/Command_Line_Options

and a smaller but more up to date list at

http://kb.mozillazine.org/Command_line_arguments

3) Not so far as I know, but I'm sure that if it is possible, someone
on this list will tell us.