Firefox and YouTube - Do you know how to fix 'Full Screen Unvailable'?

[gsdx]

With the latest Firefox upgrade (to version 50.0), I began to get this message in JUB with YouTube videos:

I reinstalled version 49, but the message didn't disappear. I've Googled the problem and everything I found talked about 'permissions' and how to fix it, but none of the directions were in my 'permissions' page. Everything there is checked 'Use Default'.

Anyone have any ideas?

By the way, JUB is the only place I get this message. If I go to YouTube through the link in the video window, Full Screen is available.

This is the page the 'Learn More' link leads to: https://support.google.com/youtube/answer/6276924

 

[GamerBear]

It probably means that full screen is disabled on embedded videos on other websites. The person of the video probably set it that way to where you need to go to YouTube to actually view it in full screen.

 

[gsdx]

^ Nope. It's every video on JUB, and ONLY on JUB, and I don't think JUB has disabled it.

 

[KaraBulut]

Are you playing videos with the Flash Player plugin or without?

 

[gsdx]

Adobe Flash. (It's listed as 'Adobe' in the 'permissions' page and 'Shockwave' in the 'plugin's page.) It was updated on November 8. It all started with the latest Firefox update.

 

[gsdx]

By the way, that annoying message over the title is gone. Full-screen is still not available, but now I only get that message when I point to the full-screen icon.

At least I can see the title again.

 

[star-warrior]

Must be something to do with the FF50 update. I had problems with tumblr videos not activating the flash player, but it seems to have resolved itself after some updates.

 

[peeonme]

If you have a back up browser such as Chrome or IE try one of them and see if it works. This might tell you if it's something to do with JUB or with FF.