Hello , i am using Firefox browser on most of my devices and i really like it , but lately i noticed some shortcomings (plugins no more working outside Firefox ESR starting with FF52) and since i often visit RT noticed that embedded videos that refer to Twitter won't work on my systems that are limited to Firefox 45 on Macintoshs with MacOS X 10.5 till 10.8. Mac OS 10.9+ can install Firefox 45+ eg FF 52 or above , but for example on Mac that is running Osx Lion 10.7.5 and FF 45 this problem appears. Here is a link to a site with embedded video that works on such a system https://www.rt.com/uk/441856-passenger-rant-rynair-flight/ instead when the embedded video is linked to twitter it won't show the video, like here https://www.rt.com/sport/441844-mourinho-temper-chelsea-khabib/ Is there anything i could do to make the video playable on Firefox 45? Thank you very much for your great work at Mozilla!