Remove cross-platform browser criterion

I think they should keep their general cross-platform criteria for desktop browsers recommendations. It makes it easier to recommend a browser to the non-tech crowd, but replace Firefox with LibreWolf and add IronFox. Maybe replace Cromite if they keep lagging behind updates. But also do specific OS recommendations like Vanadium on GOS and Trivalent on Secureblue and maybe also on Fedora-based distros, after they added trivalent-selinux in their repo. Maybe add LibreWolf to specific OS recommendations until they have macOS signing. I have no idea how important macOS signing is or care. I would personally add LibreWolf to general recommendations.