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I am running Debian 12 with KDE, and my Firefox (which is the Firefox ESR version installed via `apt`) does show up in the Applications list; however, if I run the Zed editor which is installed via Flatpak, I see the same behaviour as in your screenshot: the process shows up in Processes but not Applications.

Therefore I concur with what Quasimodo said in a comment: this is likely caused by the way Firefox is installed. Ubuntu/Kubuntu has increasingly been moving to Snap for installing various applications, including browsers like Firefox, and it seems that the KDE Applications list is not showing software that is installed via alternative packaging methods (the criteria might be that there must be a `.desktop` file in `/usr/share/applications`, although I haven't done any experiments to confirm this).