Has anyone made a plugin that forces your browser to resize slightly to help avoid fingerprinting? I feel like this is an annoyance I could tolerate, even if over the course of a day or two it causes me to resize it manually to something larger.
Firefox has this built in, about:config privacy.resistFingerprinting.letterboxing. It was contributed upstream by Tor, and off by default in Firefox.
Edit: I think I misunderstood you, you’re looking for something that adds changing noise to the viewport size. Letterboxing isn’t that, but it is another, arguably better, approach to reducing the same fingerprinting vector.
The name for that is letterboxing. The Tor Browser (and the Mullvad browser, based on the Tor one, and Firefox as of v. 67 with an about:config flag) all support it.
There are also add-ons that perform the same basic function with some added customisability [0].
