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Designing Firefox for the future
(blog.mozilla.org)
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this post was submitted on 21 May 2026
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...and then your websites break, because you actually need to render them correctly.
...or it needs to be your actual window size, too.
If the browser size is a standard size which is often tested to work with, then i don't see it as such a big of a deal. Most sites are also resolution independent. We are no longer in 2010. Do you know any site that could break because you don't use a specific resolution?
I don't think you understand.
If you spoof your resolution and window size to the degree that it's undetectable you effectively have to render it in that resolution.
Guess how websites make it so that they work on any resolution? They use relative units and whatnot that make it work that way, and all that is detectable one way or another. So you'd have to spoof it all in order to resist fingerprinting - and that is either going to break the rendering, or it's going to effectively render that website at that resolution, making it a bad experience for regular users either way.
I do wish this was an option for more "normal" browsers, and that they resisted fingerprinting better in some other ways, but you have to make serious compromises to make it work fully.