Created attachment 8843341 [details] The football is not completely visible. User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.12.2924.87 Safari/537.36 Steps to reproduce: Build ID - 20170303004003 User Agent - Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:53.0) Gecko/20100101 Firefox/53.0 Steps to reproduce : 1.Open Firefox 53.0a2 in new user. 2.Go to this link : https://simpl.info/videoalpha/ Actual results: The animation is not perfectly shown. Expected results: It should not be sluggish.
Retriage if need be.
Are you saying it is slow and/or dropping frames? If so then please provide the graphics section of about:support.