You can watch YouTube from Steam Deck Gaming Mode by adding Firefox or another installed browser to Steam as a non-Steam app, then giving that shortcut a YouTube launch address. Valve documents that desktop-installed apps added through the Steam client appear in the non-Steam library in Gaming Mode, so you keep the controller-first library instead of opening Desktop Mode for every video.
Choose the browser route first
Use Firefox when you need your normal YouTube account, subscriptions, watch history, and browser extensions. FreeTube is a separate desktop YouTube player with different sign-in and feature choices.
| Choose | Best when | What Steam launches |
|---|---|---|
| Firefox shortcut | You need your YouTube account and browser controls | Firefox pointed at YouTube |
| FreeTube shortcut | You want a separate YouTube player | The installed FreeTube application |
Install the application from Discover while you are in Desktop Mode. SteamOS uses a desktop session for standard Linux applications, and the Firefox Flathub listing and FreeTube Flathub listing are useful checks when you need to identify the app before you add it to Steam.
If Discover cannot find the browser you expect, solve that application-source problem before building the shortcut. My guide to package management on Linux explains why the package source matters, while the Bazzite review helps you separate a SteamOS step from a Bazzite desktop choice.
Add the application to your Steam library
Open the Steam client in Desktop Mode, select Add a Game, choose Add a Non-Steam Game, select Firefox or FreeTube, and add the selected program. Valve’s Steam Deck desktop FAQ describes this route and places the result in the non-Steam section of the Deck library.
- Switch to Desktop Mode and install the browser or player you chose.
- Open Steam, then add that installed application as a non-Steam game.
- Open the shortcut properties before returning to Gaming Mode.
- Set a controller layout that gives you a pointer, left click, scroll, and keyboard access.
The non-Steam entry lets Steam manage the library entry and controller mapping while Firefox or FreeTube manages the playback window and account state.
Start Firefox directly at YouTube
Open Firefox shortcut Properties and add the YouTube address after the browser’s launch options. Mozilla documents kiosk mode for command-line launches, which removes normal browser chrome and keeps the video view focused.
-kiosk https://www.youtube.com
Use this only on the Firefox shortcut you added to Steam because kiosk mode hides browser controls, tabs, address-bar editing, and easy site changes during a session.
Open the shortcut once from Desktop Mode before relying on it in Gaming Mode, then confirm that YouTube appears and Steam can close the browser.
Make controller input practical
Return to Gaming Mode and edit the new entry’s controller layout from the controller icon. Add pointer movement, left click, scrolling, and a keyboard shortcut before sign-in, search, and playback controls feel usable.
Start with a browser-oriented template, then change only the control that blocks your next action. If you need to enter an account password or a long search term, a phone paired through KDE Connect can make that text entry less awkward than an on-screen keyboard.
Keep the shortcut maintainable
The shortcut can break when you remove the browser, change its desktop entry, or replace the application with a different package source. Re-add the current application from Desktop Mode instead of editing an old target path until it happens to launch.
Decky Loader can help you improve library artwork and other Gaming Mode presentation details, but it is not required for YouTube playback. Use the Decky Loader guide only after the shortcut launches and the controller layout works.
You can use the same non-Steam-app approach for other desktop streaming or utility applications. If your next task is remote-play streaming rather than browser video, the Moonlight on Linux guide is the better starting point, and ProtonPlus belongs to Windows-game compatibility management rather than this browser shortcut.
Check the shortcut before you settle in
- YouTube opens from the non-Steam library without returning to Desktop Mode.
- The pointer can select a video and open the player controls.
- Your keyboard route works before you attempt account sign-in.
- Steam can close the browser and return you to Gaming Mode.
Keep the shortcut simple until all four checks pass. Artwork changes, plug-ins, and alternate controller layouts are easier to judge after you can launch a video and return to the library without friction.
Can you watch YouTube in Steam Deck Gaming Mode?
Yes. Add an installed browser or YouTube player to Steam as a non-Steam app in Desktop Mode, then launch that library entry from Gaming Mode.
Do you need Decky Loader to watch YouTube on Steam Deck?
No. Decky Loader can help with Gaming Mode customization, but the YouTube shortcut works through Steam’s non-Steam app feature.
Why does my YouTube shortcut open but not respond well to controls?
The app needs a controller layout with pointer movement, left click, scrolling, and a keyboard route. Edit the layout from the shortcut’s controller icon in Gaming Mode.
After the shortcut opens one video and returns cleanly to the library, give it a recognizable name and test it again after the next browser update. That small check catches an outdated shortcut before it becomes the thing you have to fix from the couch.