Hi! Thanks for the answer!
"These distros provide the relevant html5 multimedia support for chromium (and any chromium based browser) via 3 seperate ffmpeg libs: libavcodec, libavformat and libavutil. The problem is opera can neither detect them, nor use them, so you are out of luck."
-- why is that, and why don't they (Opera or the distro, whoever is responsible for that respectively) fix it?
"Use another browser for those sites."
-- well, if I liked the slow, sluggish and constantly freezing Firefox, I wouldn't be using Opera, and using both at the same time makes even less sense... Maybe I should look for some other browser instead, but so far I'm very happy with my Opera (except that it doesn't seem cool it's not open source, but I'm using it since it looks great, works well and synchronises perfectly between my Windows and Linux... except that it has this problem on my SuSE now)