Install Firefox from launchpad

*This fire firefox  have  a  TraceMonkey JavaScript engine. Is assumed to be twice as fast as Firefox 3 and ten times more than Firefox2.
* Navigating the site: the website allows the user to ask where you are. It will be useful for pages that provide weather information, or when you check your local store … It is optional and the user can enable or disable it.

* Navigate privately, not leave any trace on the computer time on the pages visited and others.
* Audio and video formats open avoiding having to use flash and labels supporting HTML 5 audio and video.
* Restore closed windows and tabs
* And much more!

Now   lets  begin de  install

edit   your  source  liist

sudo gedit /etc/apt/sources.list

now  add  these   lines  tyen save  and  exit :

deb jaunty main
deb-src jaunty main

no  add  the  keyb   with

sudo apt-key adv --keyserver --recv-keys 247510BE

Install Firefox 3.5

sudo apt-get update && sudo apt-get install firefox-3.5