Hi

I asked this question again and i reported this bug , i am a computer engineer and i tested it with few macbook pro retina laptops , when u use win 8.1 64 bit or 32 bit and install adobe flash under firefox try to play any game in facebook , view video on youtube or use any FLASH video and move the mouse above the screen of the flash game / video / etc , the screen will lag alot . under chrome this problem doesnt exist but the screen is blurry in chrome when using retina screen thats why firefox is better , but the problem is annoying . i tried to disable hardware acceleration as you suggested still the same problem