Orca and Firefox

["Christian" <christian08 runbox com>]

Hi all,
After all, I decided to go for Ubuntu since I was able to install it with the help of Orca and also since it is based on Debian which I have been using a little I know how to use apt and such.
However, how do I use Orca in Firefox or where can I find out more info?
I would also like to use braille, can I use Orca with BRLTTY like GNopernicus?
Many thanks,
Christian