How to Install multiple versions of Firefox on Ubuntu

I needed an answer to this question Today, and i found it in the link below

Summary

1- Download the old version, open firefox folder
2- Create a new Profile: ./firefox --no-remote -ProfileManager
3- Run Firefox in a process and a new profile: ./firefox --no-remote -p "NewProfile"

http://www.wikihow.com/Install-multiple-versions-of-Firefox-on-Ubuntu

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