@YamiYukiSenpai yeah, I don't know about fluffychat but I'll list a few apps that I've tried:
libreoffice: Works great while docked, but the windows that you open from inside the app (e.g the settings window) cant be moved or resized, having you moving the main window arround so that it fits on the screen. Aside from that, it works great and saves and opens files like you would espect. One thing I haven't figured out is document signing.
localsend: Works great but you cant pick the "file" option to select a specific file in the gui as your app would breeze. Putting the file you want to send inside a folder makes it so you can send it by selecting the "folder" option.
steam: won't install (had to try!).
retroarch: can't navigate UI without a keyboard or a controller.
formatfactory: works great and is very helpful, it lets you convert file types.
Keep in mind almost every snap app will have a GUI not designed for touchscreens however, so they are most useful when docked.
Running 24.04-1.3 stable on a FP5
Oh, I tried firefox again. It still displays a blank window.