Installing Firefox
From MozillaZine Knowledge Base
Basic installation instructions can also be found in the Firefox release notes.
For Microsoft Windows
Download Firefox Setup 1.0.exe to your desktop. When download is complete, double click to launch the installer.
For Mac OS X
Download the Firefox .dmg file. When the download is complete, double click the Firefox Disk Image to open it in Finder, and then drag the Firefox application onto your hard disk. Be sure to drag the Firefox application out of the disk image and onto your Hard Disk before running it.
For Linux
Download the 1.0.tar.gz. When download is complete, use an archiving utility such as Ark to extract the Firefox files. When extraction is complete, execute Firefox.