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→Is there a Nightly repository for my distro?: add link to unoffical deb package github
The advised installation method is to use Mozilla-provided builds and its software updater.
You can use "The Unofficial Nightly installer package for Debian" based distros: https://github.com/Vitexus/FirefoxNightlyDeb
If you really can't live without updates being provided through a repository, the Ubuntu Team sometimes maintains this ppa: https://launchpad.net/~ubuntu-mozilla-daily/+archive/ubuntu/ppa
