For some reason, my Firefox did not 'cache' (don't know if i use the right term) the video i load on youtube. This happened since i upgraded to Lion. This is the screenshot when i tried to load youtube videos with Firefox: and this is with Safari: Notice that in Safari, it loads the video and i can freely jump to any part of the loaded part anytime. In Firefox, it doesn't do that. I tried moving the cursor backward on Firefox, and it had to 'buffer' (spinning dots appear) the video again (in Safari, it'd be playing the part right a way). I'm pretty sure that this is not an internet speed issue. Anyone having this issue? All suggestions are accepted! Thanks!