ffprofile

ffprofile is a web site to create a configuration file for Firefox.

https://ffprofile.com/

Waterfox

Waterfox is a web browser based on Firefox with a focus on privacy.

https://www.waterfox.com/

Firefox within ChromeOS

Instructions on installing Firefox within ChromeOS on an x86 computer can be found at https://support.mozilla.org/en-US/kb/run-firefox-chromeos.  But to update Firefox moving forward, the following command must be used.

flatpak update org.mozilla.firefox

Betterfox

Betterfox is a preference list for Firefox.

https://github.com/yokoffing/Betterfox

LibreWolf

LibreWolf is a custom and independent version of Firefox with a focus on privacy and security.  uBlock Origin is installed by default.

https://librewolf.net/

How to disable ads within the address bar within Firefox

Starting with version 93, Firefox is including ads by default within the address bar.  To disable this feature, access Settings -> Privacy & Security -> Address Bar - Firefox Suggest.  Turn off the contextual suggestions option.