Firefox 4 has a new start page (about:home) instead of the old Google/Firefox page. To make Google your start page, first go to http://www.google.com/ and display the page you want as your start page. Then check out the methods described in this article: [https://support.mozilla.com/en-US/kb/How%20to%20set%20the%20home%20page How to set the home page | How to | Firefox Help]. Any luck?