So uh… why not just use Firefox directly?

Yes, I already do that but: - Vanadium is said to be safer. - The reality is that websites often don't work in Firefox anymore. - I want to be able to block social media at certain times. (Today I often circumvent such blocking in FF by just opening Vanadium…)

IronFox is Firefox with different settings. IronFox is security focused and hardens gecko preferences - https://ironfoxoss.org/docs/features/

Using a Chrome based browser (i.e. Vanadium) is not an option for me because I need my extensions and generally prefer using firefox everywhere.