A lot has changed in the browser universe since Firefox 3.0 launched in June 2008. Google Chrome burst onto the scene, and has undergone frequent updates since then. Microsoft released IE 8 and IE 9.

The difficulties of supporting some new architectural features on old chips mean Firefox 4 probably will work only on Intel-basd Mac computers. Stephen Shankland worked at CNET from 1998 to 2024 and ...