How it is possible that a package maintainer misses essential dependencies?
Works for me:
> rpm -q firefox
firefox-87.0-2.fc33.x86_64
> firefox --version
Mozilla Firefox 87.0
> ldd /usr/lib64/firefox/libxul.so | grep -e libnss3.so
libnss3.so => /lib64/libnss3.so (0x00007f225d7f1000)
> rpm -q -f /lib64/libnss3.so
nss-3.62.0-1.fc33.x86_64
> rpm -q nss
nss-3.62.0-1.fc33.x86_64
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Version 81.0.1 is out of date (81.0.1-1 is from October 1st, 2020, see https://bodhi.fedoraproject.org/updates/FEDORA-2020-2011f28eaf)
Current version is 87.0, please see https://bodhi.fedoraproject.org/updates/?search=firefox&releases=F33
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I’m sorry, by mistake I wrote the Version down listed when executing
> sudo dnf downgrade firefox
BTW: the version 81.0.1 after downgrade was working!
Bonus question: why is it downgrading to such old version? Not 86.0?
BTW: I was able to fix this issue by deleting all directories having mozilla|firefox in their names and reinstalling the firefox package…
Answer to the bonus question:
Seems only these versions are available in the repositories, 81.01-1.fc33 being the version that FC33 has been initially delivered with:
dnf --releasever=33 --showduplicates list firefox
Last metadata expiration check: 0:07:58 ago on Sat Apr 10 14:08:06 2021.
Installed Packages
firefox.x86_64 87.0-2.fc33 @updates
Available Packages
firefox.x86_64 81.0.1-1.fc33 fedora
firefox.x86_64 87.0-2.fc33 updates
But that kind of makes dnf downgrade a very sharp tool, if the repositories only keep the newest package at all 
And yes, firefox-87 seems to be misbehaving for me too, I did run dnf upgrade yesterday, and suddenly today, my day is full of “crashed tabs”.
Andreas
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