Fauxx is an open-source Android privacy tool that poisons data broker and ad-tech profiles by generating continuous, plausible, off-demographic synthetic activity from your device. The goal is simple: make your real behavioral signal statistically indistinguishable from noise.
Not my project, but though this is really cool and worth sharing.
I’d advise switching from Firefox to Mullvad Browser. They have a window size protection tool built in to obfuscate your actual screen size, as well as some other cool goodies.
the window size protection you mention is a firefox feature called RFP and can be enabled on vanilla firefox as well.