Earlier we wrote a post on how you can install Firefox 4 development version in Ubuntu. Today the stable version of Firefox 4 has been released. So, if you want to install a stable version of Firefox 4 instead of the development version, we will tell you how you can do that in this post.

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The development version of Firefox gets updated very often. However, it always incorporates the latest features and is not always stable. If you want a stable version, follow the steps given below:

1. If you are using the development version of Firefox from our earlier post, remove it with the command,

sudo apt-get remove firefox-4.0

If you are not using the development version, skip this step.

2. Now add the Firefox stable PPA.

sudo add-apt-repository ppa:mozillateam/firefox-stable

3. Now update the software list

sudo apt-get update

4. Finally install Firefox 4 with the command.

sudo apt-get install firefox

After installation, you will find Firefox under Applications > Internet > Firefox Web Browser.