linux ubuntu, how can I keep the old version and install the quantum
Often with linux when firefox upgrades a lot apps mess up. I'm afraid to upgrade to the new firefox, how can install quantum to try it out and still be able to use my present version?
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Download the version from Mozilla directly, and unpack the tar in your home folder -- you will then have both versions to play with! https://archive.mozilla.org/pub/firefox/releases/57.0/linux-x86_64/en-US/