1774
Mozilla opposes Web Integrity API proposal
(github.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Don't know about that one, you can check for IP address leaks here https://ipleak.net/
Also https://browserleaks.com/ is pretty useful
And last but not least, inform yourself if PIA is trustworthy, some VPN providers gave information about their users to the police