A Simple Guide to Installing Both Firefox 4 and Firefox 3 on Ubuntu

7 February 2011

Step 1: Add the Mozilla Daily PPA Repository #

First, open up your terminal window. Once it’s up, type in the command below to add the Ubuntu Mozilla Daily PPA repository to your system:

sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa

You’ll be prompted to enter your password. Go ahead and do that, then hit Enter to confirm the addition of the repository.

Step 2: Update Your Package List #

After adding the repository, it’s crucial to update the package list to ensure you get the latest software. Type the following command:

sudo apt-get update

Step 3: Install Firefox 4 #

Now, let’s move on to the actual installation. To install Firefox 4, run the following command in your terminal:

sudo apt-get install firefox-4.0

Step 4: Install Firefox 3 #

If you also want to install Firefox 3, you can do so by executing this command:

sudo apt-get install firefox

Step 5: Launch Your Preferred Firefox Version #

Once the installations are complete, you can launch either version of Firefox. You’ll find them in your applications menu, or you can simply launch them from the terminal by typing firefox-4.0 for Firefox 4 or firefox for Firefox 3.