Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache

Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

and

• Remove Cookies

Warning ! ! This will log you out of all sites you're logged in to. Press the Alt or F10 key to bring up the tool bar. Followed by;

Windows; Tools > Options Linux; Edit > Preferences Mac; application name > Preferences

Then Privacy. Under History, select Firefox will Use Custom Settings. There is a button on the right side called Show Cookies.

If there is still a problem, Start Firefox in Safe Mode {web link} While you are in safe mode; Press the Alt or F10 key to bring up the tool bar. Followed by;

Windows; Tools > Options Linux; Edit > Preferences Mac; application name > Preferences

Then Advanced > General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites. Are there any problems?

Then restart.

Problem was not solved; did as told 3 times. No change; cannot return to an earlier version of Firefox nor Adobe flash player. Reinstalled Firefox and Flash player. Problem still there. Very irritating. No problem with IE, thank heaven! Wife's HP laptop has also Vista but earlier Firefox release. Has no problem. Eventually, in desperation, I uninstalled Flash player. Problem vanished except Firefox which wants me to reinstall Flash player. I resist this and have no problem as I do not watch video stuff much. Vista is up to date and have clean system with Bullguard antivirus. So in a sense problem is not solved but side tracked!

I have not tried this, but take a look at it;

Video WithOut Flash {web link} Watch videos without flash