You have a rather new video-card, make sure you are using the latest of fglrx and maybe give the beta a try. Also which method did you use to install fglrx, did you download from the amd website, through the repositories or did you build the rpm yourself. Are you using UEFI hardware, I discoverd that fglrx has a lot of problems when installed on UEFI hardware. It may also be a flash player issue, check if you have the latest.
Are you sure the fglrx driver is active, you can check in yast>hardware information>display>ATI>drivers>modules>modules, check if the on saying fglrx says active. You could also try running glxgears, if you see a fps under 1000 there is something wrong with the driver.
Did you try other flash player websites?
fglrx has lots of bugs, if you are not going to do anything that requires 3D-acceleration I suggest you save yourself a lot of time and use the radeon alternative
I think use the radeon alternative is the best for me because I don’t want to play on linux. But the problem is that I don’t know how to uninstall fglrx and go back with radeon.