AIX Firefox CD
When you're installing AIX from scratch, it gives the option to install Firefox automatically with the (optional) Firefox CD as part of the final installation. As this CD is rather hard to find, there is an ISO of the image included here. It happens to contain Firefox 3.5.8 (which isn't the latest version of Firefox for AIX), however this will automatically install all of the dependencies in the correct order and have a working build of Firefox for your installation of AIX 5.3+ ready soon as you log into the desktop.
--> Mozilla Firefox 3.5.8 CD-ROM for AIX