Mozilla Firefox's default home page is the Mozilla Firefox Start Page, a customised Google search page with tips about Firefox and links to more information about Mozilla and Firefox. This page appears when you open Firefox, click the house-shaped home icon on the toolbar or click the "Home" option in the History menu. If you've set a different home page, you can always get the Mozilla Firefox Start Page back by restoring the default home page.
Click the "Tools" menu at the top of the Mozilla Firefox window and click "Options."
Click the "Restore to Default" button under Home Page.
You can also type "www.google.com/firefox" into the "Home Page" box instead of clicking the "Restore to Default" button.