My big Firefox problem is the lack of media key support. I like to hit play or pause on my keyboard and have my streaming music start or top. It's probably the one big thing that makes me run Chrome all the time.
This sounds like a pretty easy feature to implement and send upstream, you should give it a shot. In my everyone has their niche "one big thing", and it's different for every user and impossible for upstream to accommodate for. But scratching your own itches always works!
