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Firefox uninstalled itself :|
(feddit.org)
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What this person told you was wrong, you need to use
flatpak run [package id]
to run flatpak apps. You can doflatpak list
to see all installed flatpaks with their ids. An id looks something likeorg.example.app
and you'd run it withflatpak run org.example.app
.Also, is it shown as being installed in Discover? If it's not you could try just installing it again and if it is, you can try uninstalling it first. The user data for Firefox should stay intact.
And if ever unsure, look up Firefox on flathub; every app page shows the command line instructions for installing and for running it.
Bash will cache command locations so it doesn't need to scan your path too frequently. You can clear it with "hash -r".
See the other comment about running flatpaks - it's their fatal flaw imho.
its
flatpak run org.mozilla.firefox