Your Firefox home page is the page that automatically loads when you open a new browser window or click the "Home" button.
Click the menu icon in the upper right corner of your browser.
Click "Home" Tab.
Type or paste the URL of the page you want to use as your new home page in the text box labeled "Home Page and new windows" on the General tab. If you want to use the page you currently have open, click "Use Current Page." Click "OK" when finished to save your changes.