How To Install the Firefox Developer Edition in Linux Ubuntu 14.10, Ubuntu 14.04 & Others

Method 1

• Install Firefox Developer Edition, formerly know as Aurora by running the following commands:
  
sudo add-apt-repository ppa:ubuntu-mozilla-daily/firefox-aurora
sudo apt-get update
sudo apt-get install firefox

  Ubuntu versions supported: Utopic (14.10), Trusty (14.04), Precise (12.04).

Note that this method will replace your current Firefox installation.

Method 2

• Download the firefox developer edition here:
  https://www.mozilla.org/en-US/firefox/developer/
• Extract the file manually to /opt/firefox/
• Open Nautilus: Go to Edit->Preferences-> Behavior-> click on “Run executable text files when they are opened”
• Go to the file ‘firefox’ in /opt/firefox/
• Right click and select Properties–> Permissions–> Execute: Allow executing file as a program.
• Open terminal and type:
• 'gnome-desktop-item-edit' not installed in your computer then you want to run following command
  

sudo apt-get install gnome-panel

then run following command

gnome-desktop-item-edit ~/.local/share/applications --create-newCreate a shortcut and it’s done.

Clean Your DNS Cache to Fix Browsing Problems

If you've found yourself hitting DNS errors or 404 pages in your browser but you know your net connection is working fine, it might be time to flush and restart Windows' DNS cache. The How-To Geek shows how to do this in three command line entries, although you might only need the first to see results. After launching a command prompt as an administrator and closing down Firefox (which has its own DNS cache), enter the following:

ipconfig /flushdns
net stop dnscache
net start dnscache

The Geek also shows you how to restart the service in Windows XP or Vista's DNS service from the graphical services menu.

Troubleshoot Browsing Issues by Reloading the DNS Client Cache in Vista [The How-To Geek]