UPDATE: Valve will reportedly be using the Flatpak version of Firefox with the next update to SteamOS 3.3, according to an update from GamingOnLinux. Well, at least the stock version of Firefox supplied with SteamOS. It’s come to my attention, thanks to Quinn from our Matrix channel, that SteamOS is using a highly outdated version of Firefox. The latest version is 102.0.1, which came out today. However, the latest build on SteamOS, even on the beta 3.