I've wondered the same, the answer seems to be maybe, but the challenge is doing so in a way that doesn't blow up normal webpage functionality.
For example, a fingerprinting script might try to measure the viewport height and width, calling on window.height can give it that info, but if Firefox were to fake that info when a friendly script calls for it, the page might try to reflow to the new size, etc. All kinds of desired behavior can use these same values, the challenge is determining whose a bad actor.
For example, a fingerprinting script might try to measure the viewport height and width, calling on window.height can give it that info, but if Firefox were to fake that info when a friendly script calls for it, the page might try to reflow to the new size, etc. All kinds of desired behavior can use these same values, the challenge is determining whose a bad actor.