Does somone know how to install firefox nightly.
Welcome to 
https://wiki.mozilla.org/Nightly#Linux
As an aside, I would like to add that the Copr repo for Firefox Nightly has not been building for quite some time. I have no clue who to ping on this but definitely do not add that repo.
https://copr.fedorainfracloud.org/coprs/proletarius101/firefox-nightly/builds/
There hasn’t been a successful build in over 2 months.
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Firefox Nightly can be installed
- As a flatpak, see my repo for a list of flatpak remotes, including the repos for various Mozilla products, that ship flatpaks using the binaries
- As the binary, following above guide
I used the Flatpak (well, dogfooding my own repo list of course 
) for FF and TB Nightly and they are pretty great.
I prefer them over the standalone binaries, as they are centrally updated and have permissions.
BUT, using the Flatpak is more insecure in terms of sandboxing processes from another. This is a big flaw in Firefoxes design that makes it incompatible with (filesystem) isolating processes as a Flatpak.
So for FF I use the RPM or binary nightly, for Thunderbird I use the Flatpak, as process isolation is not important there.
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