What could be the reasons for not being able to install mozilla?

Question

Mozilla Firefox

The system was installed a long time ago, it was also mozilla from last year, it was updated regularly, but today I noticed that no video is played on any site (except YouTube), while in other browsers (opera, chrome) everything is fine.
At first I thought to reinstall the flash, updated it, it didn’t help, I updated the firewood, it didn’t help, uninstalled the mozilla and thought to install it again, here is the result ...

How to be now?

Of course, you can use another browser, but firstly I'm used to it, and secondly, something is wrong if such a problem ...

Answer 1

Hm. Is this the official build? I have never seen such a message "Optimization of blablabla ..."