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Actually now using this and seeing the results, I think Chrome caches assets much like this extension does. It gives a huge perceptive speed boost to Firefox. Mozilla devs need to look at including this in Firefox by default. It's huge in terms of speed and Firefox's competitiveness with Chrome.

I believe it still sends a network request to check the status of the resource. But an extension can bypass this and assume that the asset has not changed.

Indeed. Or check it every x hours in the background. Or the developer keeps up with jQuery news (and a few other big ones) and pushes updates. Or developers can push updates themselves. Many simple solutions that give a speed boost on many sites already.

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