If you are like many Mac owners that have older Powerbooks that run on PPC (Power PC) architecture, you’ve probably noticed that your laptop isn’t what it used to be for handling harder applications. What I mean is, that although your powerbook can still work pretty well for emailing and web browsing, it has a hard time handling HTML5 and CSS3 while many browsers have left PPC architecture behind. Even Mozilla’s Firefox 4 has dropped support for the PPC architecture.
If you haven’t already replaced your older computer, you might not have to. Now there’s a program called TenFourFox that takes Firefox 4 and works with OS X 10.4 and OS X 10.5.