Sadly, Firefox no longer includes support for MacOS 10.4, however you can still use browsers similar to Firefox. <br> [http://www.tenfourfox.com/ TenFourFox] is an unofficial build of Firefox for older Macs, and so will work on your computer. However since you are using a really old computer, it doesn't have all the features Firefox has. <br> [http://caminobrowser.org/ Camino] is a community project to make the best Gecko-based browser for Macs around. Unlike TenFourFox it doesn't try to be Firefox, but instead does its own thing. <br> [http://www.seamonkey-project.org/ SeaMonkey] is another community effort and is a continuation of the original Mozilla Suite which shares a few similar properties with Firefox. SeaMonkey is great for people who like their browsing experience retro.