I like this in principle. I think it should be abstracted out to a simple package system or something though. When you go to a sight that requires JQuery, your

I like this in principle. I think it should be abstracted out to a simple package system or something though. When you go to a sight that requires JQuery, your browser checks the sha256 hash or something against it's canonical list of published packages. If one is available it installs that one, or uses the one already installed. If the sha hash doesn't match it goes ahead and downloads the one from the site. However, is transfer time really the biggest issue here?