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How to Switch From Chrome to Firefox (and Why You Should)
(lifehacker.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Mullvad browser is based off the Tor browser, which is based off of Firefox. It's basically a secure/hardened Tor browser minus Tor, which makes it slightly more usable for private.
Source: https://mullvad.net/en/blog/mullvad-vpn-and-the-tor-project-team-up-to-release-the-mullvad-browser