first you need to uninstall existing firefox !

[email protected] ~ $ sudo autoremove firefox                          

then type this command in a terminal to add repository to system

[email protected] ~ $  sudo add-apt-repository ppa:ubuntu-mozilla-daily/firefox-aurora        

then update your system

[email protected] ~ $ sudo apt-get update                     

then install firefox

this will install firefox Developer Edition (Aurora)

[email protected] ~ $ sudo apt-get install firefox    

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