How to play HTML5 videos? Please help

So I've used Firefox since ever it came out and now I have problems with playing videos on YouTube because of the HTML5, I currently have Firefox 35.0.1 and I even had 36 but the problem was still there, the only way I found to solve this was to downgrade to 31 since it still uses flash, please help me here, the videos won't play on Firefox but they will play in Internet Explorer.

''John99 [[#answer-691133|said]]''
<blockquote>
May be difficult to sort out if you are on the unsupported Firefox 31 I suggest you upgrade *
If you do need to use Firefox 32 a safer method that works in some cases and in this sort of situation is to use the current up to date secure and supported version (Fx 35.0.1 at the moment), but spoof Fx31 by using an add-on to switch the User Agent String. There is even an add-on but for the opposite problem
* https://addons.mozilla.org/en-US/firefox/addon/youtube-flash-video-player/
Firefox 35 works for me playing Youtube HTML5 videos.
I attach screenshots of
*https://www.youtube.com/html5 offering HTML5, and using HTML5
Click thumbnails for larger image
YouTube has been making changes and may make further changes relating to different Firefox versions and the Flash/HTML options on YouTube. If anything the more likely problem is being offered only HTML and not FlashPlayer.
Another complication, but again the other way round is that due to a series of security patches having been issued recently for FlashPlayer, so users may have old versions of FlashPlayer that Firefox blocks.
===*===
More complicated but it is possible to install multiple versions of Firefox, but you should also use separate profiles for each version. It is something you may consider trying if you need to keep a working Firefox 31 for playing You Tube until you sort out Fx35.
* http://kb.mozillazine.org/Testing_pre-release_versions#Installing_multiple_versions
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox
</blockquote>
This is what I get

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