The only thing I don't like about Firefox (other than no PWA capability) is the 'dark pattern' of how when the home page loads, the first three of the six items shifts to the right after the page has started loading, and are replaced with sponsored links. So, if I go to click on YouTube when I launch Firefox, there's a fair chance that by the time I get to click there it'll suddenly jump over to the right and I'll end up clicking some other link.