SOLVED YouTube won't show on firefox

[John RB]

Hi, I'm new to windows 10 having migrated from a Mac (XP was the last windows I used regularly).
I installed Firefox browser but Youtube won't show video, ...only sound. as you can see from the screenshot ...not even a dark screen, ...just no video. ...and yes, Youtube shows fine on Microsoft Edge. I'm curious if this is just a windows problem, ..a Firefox problem, ..or just something I've overlooked.

 

[John RB]

Thanks for getting back. It's latest version Firefox quantum 60.0.02.
Videos run fine on vimeo and facebook.
I've installed Flash player and it's on the task bar on Firefox browser.
As you see from the above attachment, the video is missing (not even a blank screen) but the title and like bar and comments are there, .. as is the sound of the video, so it's playing but hidden somewhere..
I havent deleted and re-installed Firefox yet, ...i'll try that if there's no other options...

 

[Grizzly]

Have you tried to create a new profile yet? Just a blank profile without any extensions, addons, and so on.

 

[John RB]

Thanks Guys, .... I created a new profil and it did the trick. ...Still confused as to why, ...but good advice from you.

 

[Grizzly]

Now you can transfer your bookmarks etc to the new profile.last but not least install the extensions you had one at a time and check if youtube still works...

 

[John RB]

That's all done. ...working fine now. Thanks for your help!