What's your computer system and Firefox version?

Please explain the problem in detail.

firefox 53.0.3 win 10 Version 10.0.10240 Build 10240

jackite said

firefox 53.0.3 win 10 Version 10.0.10240 Build 10240

FredMcD also asked you to explain the problem in detail   .......
Like :   videos won't play,   no audio   ......   ?

some but not all videos wont play

jackite said

some but not all videos wont play

Just a black screen   ? Stuck on   'loading'  ? No sound   ?
If you have add-ons installed like AdBlock Plus or Flashblock :   disable it.
Would you take a look at this and see if you can find an aswer to your poblem here :

https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues

black screen with waiting circle going round. otherwise nothing happens. videos work fine with 'edge' browser. so i will probably switch

jackite said

black screen with waiting circle going round. otherwise nothing happens. videos work fine with 'edge' browser. so i will probably switch

You posted while I was typing my reply;   would you try and see if any of those suggestions might help   ? Switching to Edge before even waiting for an answer is a bit drastic, don't you think   ? And :  if none of the above fix the problem,   somebody else might come up with the perfect solution   !

Right-click on the player. What type is it? HTML5, flash . . . . . .

Make sure your Flash Player is up to date. Note: Windows users should download the ActiveX for Internet Explorer. and the plugin for Plugin-based browsers (like Firefox).

Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the ActiveX.

Flash Player Version: 25.0.0.171

https://get.adobe.com/flashplayer/ Direct link scans current system and browser Note: Other software is offered in the download. <Windows Only>

https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download. <Windows Only> +++++++++++++++++++ See if there are updates for your graphics drivers https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

In addition to the above   (as YouTube uses HTML5 when possible):

Would you go to this test page and see which are checked :

https://www.youtube.com/html5

I have an issue with you tube, too. Do not know where to post this question/problem. As all with firefox, its all too complicated for me.

I have clicked the link provided above https://www.youtube.com/html5 and in red are H 265 and WebMVP8. All other boxes are in blue and checked. My OS is Windows Vista. I had been able to view youtube nearly trouble free for many months (using firefox) until yesterday. The screen is black with a message about html5 and then goes to a screen message that says "if player doesn't start, restart device..."

I have opened and read thru links provided above and I have tried to update my adobe but my windows manager continues to block any updates. I have tried to install the Platform Update for WIndows Supplement but so far no luck.

My computer skills are limited:) I can follow easy instructions but don't understand most of what I'm doing - and then basically lost as to what to do when things fail.

Sorry this is so wordy. I don't even know where to post this so I'll just post it here...thanks. Please help me...

Reply moved over here: https://support.mozilla.org/questions/1169721#answer-992214

jscher2000 said

Reply moved over here: https://support.mozilla.org/questions/1169721#answer-992214

Thanks!