In my case this version of firefox 45-9-3, works the same as others, but youtube videos they are not visible. A wheel comes out spinning, and the video is never loaded. When closing it does not close either, I have to kill him.
The videos on YouTube, had two problems,
1 - sometimes stopped the video and to continue I had to press Wi-Fi on-off and I continued
2- The second problem was that the sound was repeated, and you had to close firefox, and tell cancel
so that it continues.
The first error was repaired recently but the second error was not.
The second error now, is very similar to the first, sometimes I have to press Wi-Fi on-off to continue.
Sometimes when you stop by clicking with the mouse on the time bar projected, continues to be seen.
The versions that work best for me are the FF45.5, and almost all the seamonkey.
But I also have applications that need wifi on-off to continue, and that do not have nothing to do with the browser.
1- In a two-window session, if I execute qbasic, pulse esc, alt + f, and move through the menus
it locks, if I leave it the laptop heats up and goes out. If pulse wifi on-off continues without problems
until it locks up again, the application.
2- If I run find ... of the xcenter, looking for a file in a large unit, the same.
3- If I run find ... of the xcenter, and tell it to save the result in a folder, the blocking
it's the same but much worse, not just wifi on-off to continue, I have to remove and plug the mouse usb to continue and turn off the computer.
In a full-screen DOS session the qbasic does not give me that error.
saludos