Firefox is almost no where to be found and hardly has anything to bring to fight against Chrome [0]. In fact, Mozilla is on life support with Google's money with the Mozilla CEO being the one laughing all the way to the bank as Firefox continues to be irrelevant.
Safari (WebKit) is the only one competing against the Chrome ecosystem, especially on mobile devices market. The EU Digital Markets Act will just declare Chrome the winner and will increase Chrome's dominance and will make Mozilla even more irrelevant.
[0] https://gs.statcounter.com/