On the Mozilla.org home page, go to the Download section.
Find the operating system that you are using (either Windows, MacOSX
or Linux) and click the link.
You will get a warning that you are downloading a file, go ahead and
click save. A window will open asking where you want to save the
installer file. Choose the desktop and click save.
You will then get a window informing you that the download is complete.
Go ahead and click open. A setup wizard will open to walk you through
Before starting, make sure you have quit out of all other programs,
then click next.
Read the license agreement and choose accept.
Make sure the radio button for “complete” is selected and
that the destination directory is in program files, then click next.
If a window opens asking if you would like to create a directory, click
Leave Quick Launch unselected and click next.
Leave the box for saving downloaded setup files unchecked and click
Click Install! Depending on the speed of your connection, this may take
a while. Once installation is complete, a Mozilla browser window will
automatically open up.
You can decide if you want Mozilla as your default browser.