I have a problem viewing videos on YouTube. It's the same problem as in this thread ---> here
there's however an exception: I can watch a video that is located in user's profile.
I tried all the advices about reinstalling Flash Player, but still it doesn't work
Except YouTube I also have trouble with DeviantArt (http://www.deviantart.com/)
some of graphic elements won't work properly such as zooming pictures, viewing galleries (even my own) or faving pictures. I tried writing to the DeviantArt staff but their advice was nothing of what I haven't checked before I wrote to them. (Such as 'check if your browser is up to date', 'or clear your cache')
I'm using Mozilla Firefox (version 18.104.22.168) and it's updated regularly.
I would really appreciate some smart advice as it pisses me off more and more