"Mozilla has already provided users with a check in Firefox
3.5.x for Adobe's Flash plugin, but they've recognized it's not
enough and have expanded the effort.
"With its new Plugin Check site, Mozilla will check 15 popular
plugins on a users Firefox browser to ensure they are up-to-date.
Yeaah it sounds simple, but in my own little test case today I
found out how amazingly effective it is."