i have been using firefox to download off of youtube. after downloading serval clips, it does download anymore, does anyone know why.
No idea as i don't bother with Firefox plugins (if that's what you mean). Try http://www.keepvid.com, that's all i use to save youtube videos..
somewhere within the firefox folders there is a directory called "cache" .. in there go all temporary downloads and images.. look for any file you have watched that is about 9mb's.. it will have a long number and no extension.. rename it "whatever.flv" and vlc will play it. No need for these retarded and constantly stumped downloaders.
Just use this bookmarklet, Works fine. http://googlesystem.blogspot.com/2008/04/download-youtube-videos-as-mp4-files.html