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Firefox Forever
(www.quippd.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Also integration with Firefox (or like this) can be pretty neat. Though I hear Mullvad has its own Firefox fork now, probably with the same idea.
Mullvad Browser? It's basically Tor Browser without the Tor, meant to be used with a VPN instead. It has integration with Mullvad VPN by default, but that add-on can be removed, and the browser doesn't need Mullvad VPN in order to function. Since the browser is based on Firefox, someone might want to fund Firefox development by using it with Mozilla VPN instead.
Yep, that's the one!