Chameleon add-on for Firefox, randomly rotates your browser, OS, screen size, timezone, device type, language, and other customizable parameters every x minutes.

I've set it to do so every 5 minutes, and to omit desktop & tablet as device types (else some websites display the respective page) and timezones (messed up 2FA).

I also disabled blackberry and windows phone from the manufacturer ID, that would have the opposite effect from obscuring me.

For the rest of it, it's working great.