There are some known issues with the Shockwave Flash plugin for Firefox that some are suffering from, so you will have install the plugin to see if you need to take action and how the plugin works. In case there are problems with current Shockwave Flash plugin versions, you can try this: *disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later) *disable hardware acceleration in the Flash plugin See also: *http://kb.mozillazine.org/Flash#Troubleshooting A possible option is to set the Flash plug to click-to-play by setting the permissions for Flash to "Ask To Activate" in "Firefox/Tools > Add-ons > Plugins".<br /> That way you can activate the Flash plugin when you need it via the Lego block icon on the location bar.