User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0 Build ID: 20141222153228 Steps to reproduce: Nothing, flash disabled and youtube/othersite playback of videos using firefox without flash. Actual results: video quality and gamma is bad, black colors are no longer black, they appear to more greyish, as does the entire video.. its not as good as flash video playback in quality. Expected results: html5 video quality/brightness/gamma is kinda bad to be pushed mainstream, i mean I can play the same videos on chrome without flash, those same(all) videos have better gamma/brightness.. its not over bright and washed out like using firefox .. can't firefox get it right.

Please check if the issue occurs using Firefox in safe mode (with your addons disabled): http://support.mozilla.com/kb/Safe+Mode And on a new, empty profile: http://support.mozilla.org/en-US/kb/Managing-profiles#w_starting-the-profile-manager Also try with e10s OFF.

mades no difference, it is the html5 video codec or whatever that firefox uses and how it handles video. easier to just use chrome to watch videos where the color, gamma, brightness etc is better, unlike firefox with html5 video being washed out brighter etc

This sounds like bug 1125844 to me.