Install firefox nightly on ubuntu/mint

for the nightly builds of firefox do the following:

1. just include the following ppa:$ sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa
2. update and install the package, called firefox-trunk

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source: support.mozilla.org

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for the firefox-next install see: https://itgrenade.wordpress.com/2016/07/11/install-firefox-beta-on-mint-ubuntu-debian-etc/