How to Install
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2. Setting Up FlatpakHow to Install Flatpak on Debian Linux To check if it’s already there try: which flatpak 
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3. Installing FirefoxThen to Install Firefox Flatpak App on Debian Linux 
 To Setup the Repo play:flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo For further Insight see the Flatpak Official Documentation. 
 And after:flatpak install https://dl.flathub.org/repo/appstream/org.mozilla.firefox.flatpakref The Flatpak App Setup do Not need the sudo Command because then it Runs confined into a Sandbox. 
 Then Confirm the proposed Setup with ‘Enter’ and Wait patiently until the App is Downloaded, Build and Installed.
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4. Launching FirefoxFinally, Launch & Enjoy Firefox 
 Use the desktop Launcher: 
 Of from Shell with:flatpak run org.mozilla.firefox   
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