- Open the application called ‘Terminal’
- In this application run the first command:
flatpak install --from https://firefox-flatpak.mojefedora.cz/org.mozilla.FirefoxNightly.flatpakref
- Second command:
flatpak run org.mozilla.FirefoxNightly
flatpak install --from https://firefox-flatpak.mojefedora.cz/org.mozilla.FirefoxNightly.flatpakref
flatpak run org.mozilla.FirefoxNightly