I use it in my normal Firefox setup, but I've been playing with Mullvad browser and I've kept everything to the defaults so I have a good option when I want a little more anonymity without needing the nuclear option (Tor) for sensitive-ish-but-really-not-all-that-sensitive browsing....
ArsTechnica article on the letter. Just a short summary, with some more context on other works and investigations into the auto industry's privacy issues....
'The Bill only targets the less well-off. There is no equivalent surveillance of legislators who accept payments to advance the interests of their corporate paymasters.'...