Flatpak is a new packaging format for Linux. To setup Flatpak, visit FlatPak's setup guide and select your OS and follow the installation steps.
Once you have Flatpak installed, go to the Firefox Flathub page and click the Install button. Once downloaded, follow the command line instructions at the bottom of the page.
Once Firefox is installed from Flatpak, updates are automatic so no need to reinstall.
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