Waterfox is an independent fork of Firefox developed by Alex Kontos. It has several added features such as tracking protection, built in container tab support (eg private browsing in the same window, very neat feature), and Mozilla's telemetry is disabled too. It's a lovely little browser in general, I don't know why I love it so much tho, you could achieve the Waterfox experience with Firefox and some addons probably. Perhaps it's just the appeal of a (more or less) independent project to me, I don't know. It has some history too like I think it supported x64 on Windows before Firefox did but I'm not a long time user so that might be wrong. I'd give the website a once-over if you're interested.