Firrefox and flash

sup all, i have a simple ?

wtf is it with firefox and flash, its pissing me off, when i go to some sites, flash doesnt work…i try to scroll and i get the no icon, the circle with a slash across it telling me i cant do it. then the buttons downt work and neither do the links.

mouse/roll overs appear like 20 seconds after…

any one knows why this is?