The specific problem i have is that playing HD videos online irrespective of the website is always choppy. but the video plays fine in lower formats like 360p and 480p. i don't think my computer is the problem because similar videos play fine on internet explorer. I use Toshiba computer that's pretty old and i use windows 7. But like i said earlier the same old system plays the HD videos on internet explorer so why not on firefox. am using the latest version of firefox. so i will appreciate any useful solution to this problem as am enjoying my firefox experience up until this point.