ps. using https only add on will aggravate matters. you need to add a rule for you tube so it will only operate when you log in to your account, not when you are streaming videos. you can't force google to stream its videos https. it doesn't work yet
Plug in checker is pointless if someone like sun java or adobe flash/shockwave aren't updating for your os anymore. Unless your willing to get on Apple's endless consumer treadmill and buy a new computer every four years.
I have snow leopard and they act like its windows 98. Xp is still supported by Microsoft for security updates its on the longterm part of the release now.
Ironically I also have a powerpc g4 laptop and use ten forty fox browser, and it has no plug ins in it. But I am able to still view videos without them using the work arounds the ten forty fox community supplies. check it out. mactubes, quicktime enabler etc.
It is no longer save to use java plug in or adobe on a ppc box. You can remove them from your browsers esp Safari and still be safe and still view videos. Opera I guess has abandoned ppc users even for powerful boxes like G5's and Pros. I still prefer Opera to Safari for macs since Apple in its wisdom, like Google and Chrome, won't let you grab videos. Opera will. The internet is my tv. no cable no satellite.