F-Droid doesn't package Binary drivers. They don't package drivers altogether, and they don't package anything they don't compile. They used to package upstream Firefox, but they don't seem to do that anymore.
They don't package upstream Firefox, but you can get GNU IceCat Mobile (which is the GNU fork of it). And they also package Firefox Klar (which is the European edition of the "always incognito" version of Firefox they released last year, with all the telemetry disabled).
Firefox Focus elsewhere I think? I really like the concept, I've made it the default browser for opening links and switch to Firefox mostly just when something doesn't render properly (scripts blocked perhaps?)