This only works in Firefox 4 and Above...

I am running Fedora 14 on my Main Computer and it is only up to Firefox 3.6... I Have Fusion 14 (Fedora Remix) on another Machine and it came with Firefox 4. After Tweaking the Setup and Icons a Bit. I decided I liked Firefox 4 and wanted to use the Sync Options. But Sync is not implemented in Firefox 3.6... So, here's what I ended up doing... Installing Firefox 5... Because I couldn't find Firefox 4 on Mozilla's Site...

Don

Installing Firefox on Linux

Getting Firefox installed on your computer is your first step to using it. This article will show you how to install Firefox on Linux. For other operating systems, see Installing Firefox on Windows and Installing Firefox on Mac.

Many Linux distributions include Firefox by default, and most have a package management system that lets you easily install Firefox. Generally, you should install from package management. Package management will:

Ensure that you have all the required libraries
Install Firefox in a way that works best with your distribution
Create shortcuts to launch Firefox
Make Firefox available to all users of your computer
Make removing Firefox work the same as removing any other application

Package management also has some downsides:

It may not give you the latest version of Firefox
It may give you a version without Firefox branding

Installing from a package manager

To install Firefox using the package manager, please refer to the documentation of the Linux distribution you're using.

Installing outside of a package manager

Complete instructions for installing Firefox outside of package management may be available at your distribution's support website. For example:

The following instructions will install Firefox into your home directory, and only the current user will be able to run it.

Note: The installation file provided by Mozilla in .tar.bz2 format does not contain sources but pre-compiled binary files, therefore you can simply unpack and run them. There is no need to compile the program from source if all the system requirements are met.

Download Firefox from the Firefox download page to your home directory.
Open a Terminal and go to your home directory: cd ~
Extract the contents of the downloaded file:tar xjf firefox-*.tar.bz2
Close Firefox if it's open.
To start Firefox, run the firefox script in the firefox folder.

~/firefox/firefox

Firefox should now start. You can then create an icon on your desktop to run this command.

libstdc++5 error

As noted above, you need to install the required libraries for Firefox to work. Many distributions don't include libstdc++5 by default.

"firefox not installed" message or wrong version of Firefox starts

If Firefox is installed following the instructions given above, it must be started (in a Terminal or in a launcher on the Desktop, for example) using the command ~/firefox/firefox If you try to start Firefox in a Terminal with the command firefox it will either start the package-manager-installed version of Firefox or will tell you the program is not installed.

Contributors to this page: Chris_Ilias

Go there...
http://support.mozilla.com/en-US/kb/Installing%20Firefox%20on%20Linux

Updating Firefox

Firefox automatically updates itself. This article explains how the update process works and how to manually check for updates.

Note: If you use your Linux distribution's packaged version of Firefox, you will need wait for an updated package to be released to its package repository. This article only applies if you installed Firefox manually (without using your distribution's package manager).

Read More...
http://support.mozilla.com/en-US/kb/Updating%20Firefox?s=update+firefox+linux&as=s

How do I set up Firefox Sync?

When you set up Firefox Sync on your computer, all of your data (such as your bookmarks, history, passwords and open tabs) gets stored securely on the Mozilla servers. Then you can connect other devices (a mobile phone for example) and they will be automatically synchronized, giving you access to all of your information no matter where you are. This article will walk you though setting up Firefox Sync for the first time.

Once you've set up Firefox Sync, see How do I add a device to Firefox Sync? to learn how to connect other computers or mobile devices to your Sync account.