How to install Firefox 20.0 correctly in Ubuntu Or Linux Mint

Here is the Resource Page: http://www.ghacks.net/2013/04/02/firefox-20-0-find-out-what-is-new/ Install: sudo add-apt-repository ppa:mozillateam/firefox-next …
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link : http://www.youtube.com/watch?v=qh8UifnvbxM