1. At the top of the Firefox window On the menu bar, click on the ToolsFirefoxEdit menu, and select Options...Preferences....
2. If it isn't already selected, click the Main icon. The Main options panel is displayed.
3. In the Startup box, highlight the text in the Home Page: box.
4. Replace the text with the address of the CVS website you wish to be your new home page. Copy and paste or retype the following: http://www.commercialvehiclerentals.co.uk/

See image below: