The AddOn "Disable Cookies" is a maybe Solution. With a click it disables the cookies with activating it again, all the cookies of the current site seems to be removed.
I decited to use the sixth solution, switch to the new Opera, which have lots of disadvantages but also some advantages. Without able to read websites sometimes or having maybe only one font is no solution for me.
I wonder, because the problem started just out of nowhere some weeks ago and is on most websites. Maybe one of the webfont services changed something.
ahhahaha dude i don't speak spanish either but that was all english ... hola en la pagina, that is self explanatory, el video=video, las opciones del menu= the options of menu, En windows = windows, opera link = opera link.......... awzx , dude that video is old, it doesn't actually explain anything,