As @denschub@schub.social always emphasises: make sure to file a report at https://webcompat.com!
We ask everyone to file their reports, because all reports are really useful. Even if we don’t respond to every single thing you report, it’s a signal that we’re processing in many different ways. (…) please, keep reporting all issues you see, because every single blip counts!
https://www.reddit.com/r/firefox/comments/1de7bu1/comment/l8ghtr2/
It’s on the roadmap, though I imagine doing it properly is going to take a while - the test build was very rough, just to verify whether it was even realistic.