Firefox tips

(1) To clear recent history:

       Ctrl+Shift+Delete

 (2) To know the version of Firefox that you are using currently:
 
        Help -> About Firefox

 (3) To update Firefox:

       apt-get install firefox (as root)

(4)  Proxy setting (chrome/firefox/general):
       option 1:
        In "systems settings", go to "network" and then to "network proxy" and set your proxy system wide.

      option 2:
       vi /etc/environment
        insert the following:
        PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
        http_proxy="http://yourproxy:8080/"
        https_proxy="https://yourproxy:8080/"
       ftp_proxy="ftp://yourproxy:8080/"
       socks_proxy="socks://yourproxy:8080/"