nostr:npub1gv8d05f9c55ve9h34rw65v7lvhynvdam5s965m9rajqt9gvk7r8slvuu0q nostr:npub15c0uz3l55klsrq6l9zlvmtkvxwv2wy7q0rm7y249qkmzxpaj5gks5thxke Mozilla builds and distributes Firefox officially on Flathub, and Valve ships it that way on Steam Deck! But I am not aware of any of the Chromium-based browsers doing so (yet). We're talking with them, though.
Anyone on the Vivaldi team is welcome to hang out with Flatpak folks on Matrix and chat to better understand things; we'd love to see Vivaldi even more easily installable on Steam Deck and Linux distros.