Firefox 44

[#1]

just since FF updated to 44 i cannot play HTML5 or flash videos    is it just me ?
Tried start without add ons , refreshed FF still no joy . But Utube is the only page that  works 
They play fine in Chrome & Edge so its not my PC

[#2]

It may be unrelated but I was reading this yesterday and to quote from it :

Quote

By late 2015, many browser vendors have either removed or announced timelines for the removal of standards based plug-in support, eliminating the ability to embed Flash, Silverlight, Java and other plug-in based technologies,

You may want to look at FF's change log to see if this is the case.

[#3]

Just used BBC iplayer HTML5 beta without issues on FF 44 and ditto youtube.
Went to ITV hub and played Flash video there too without issues

[#4]

Just updated to FF 44, speedof.me works fine. (HTML5 speed test) I don't have flash installed.

[#5]

FF 44 change log https://www.mozilla.org/en-US/firefox/44.0/releasenotes/

[#6]

Yep, unrelated, but it could have been.

[#7]

Now that's Strange   Removed FF44 with revo uninstaller , checked Regedit removed what I find for Firefox , clean with Ccleaner  , restart installed FF 43 which before played all videos, ,,,,,,,,,,,,,,,,,,,  now it still wont play  
I have now removed latest Nvidea driver reverted back to older one , still no difference ?

[#8]

Now have tried FF 64bit & Palemoon browsers still no video playback  
Edge browser is Pants , Chrome is,,,,,  well slow compared with FF but have to use it 

[#9]

Can I suggest that you try installing WaterFox. I am using this on my Mac and it works for me.
https://www.waterfoxproject.org/
If, after you install, it still doesn't work can you provide some URLs for links that do not work please.

[#10]

Cheers Mook , i now have BBC i player working , 5 OD , Channel 5 , Quest Tv  all work  
But i get no sound on any Utube video  
Update i get sound on Utube Via headphones , but not speakers ?

[#11]

That's good news. 
Best to check your audio settings then, it might be a configuration issue since the sound is evidently there, either that or you've got a dodgy headphone socket which isn't unlatching when you remove the jack.

[#12]

Everything seems fine for me with FF44
For a non techie how to I check if HTML5 has been installed on my PC?

[#13]

HTML5 is a site coding language and wouldn't be on your PC at all

[#14]

Mook , my sound card has separate headphone amp , so headphone & mic has separate plugs from speakers .
Maybe its the Dolby setting for speakers dont like utube , as Win 10 says Dolby settings are incompatible   

[#15]

Well the easiest work around there is to connect your speakers to the headphone socket assuming they are compatible i.e. 3.5mm jacks. But I guess you'll have thought of that but there must be another work around any driver updates for your sound card chipset?