@lolcat:
a.) Sure, that's possible, take a look at
https://board.jdownloader.org/showpo...29&postcount=3
you can customize the command line, %s will be replaced by the URL by JD.
b.) you might wanna try the ff 48 xpi, from
https://my.jdownloader.org/apps/
(no promises)
I would suggest to go with a.) and setup ff or chome and setup JD to use those for the captchas and then you can still use Basilisk Browser for daily work
