I am running fedora 26 and I wanted to install firefox nightly (currently 57) alongside firefox 56 in the regular repos.

I followed the instructions on the flatpak page:

flatpak install --from https://firefox-flatpak.mojefedora.cz/org.mozilla.FirefoxNightly.flatpakref flatpak run org.mozilla.FirefoxNightly

But when I do this it just starts up firefox 56 and not nightly. What could be the reason for this?

1 Answer 1


It's just that any installation of Firefox tries to switch to the existing process unless --new-instance is given on the command line. As such, GNOME confuses names of multiple different Firefox installations may be a topic here, as it's also using this class name for that, I think, at least.

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