Dual 1GHz G4, 1.5Gb RAM, Nvidia Geforce 4MX, OS X 10.4.11: Some youtube videos play just fine, some do the old 1-2fps slideshow thing. I use a FF extension called DownloadHelper, which adds a button to download the video, and (sometimes) lets you extract the raw file from the Flash wrapper.

youtube still supports WAP/mobile mode, using the old 320x240 format that buffers in quicktime

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How do you access that?