#Debian sid currently distributes an out-of-date #Firefox version to its users:
https://packages.debian.org/sid/firefox
Apparently, that's because their #rust compiler is outdated as well.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=955638#32
Firefox 75 was released April 7 and (among other changes) fixes three security issues classifed as "high impact"
https://www.mozilla.org/en-US/security/advisories/mfsa2020-12/
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I'd recommend #snapcraft distributed #firefox as it has stronger system confinement than .deb and go straight for beta:
snap install --channel=beta firefox
The only thing to know: your profile lands in ~/snap/firefox/common because this is the root for confined filesystem
