1. First, navigate to the website that you want to use as your homepage.
2. Then in Firefox, click on Tools / Options...
3. Click the General icon on the left.
4. Click the Use Current Pages button.
5. Click the OK button.

A Clear Recent History window will appear.
Place a check mark next to the items you want to delete.
Press the Clear Now button.

Click on the star . The star will turn yellow and the bookmark will be added to a folder called Unsorted Bookmarks. To change the name of the bookmark or the change the folder it's in, click on the now yellow star again. A menu will drop down, from there make your changes and click the Done button.

A quicker way is to press CTRL+D. This will drop the menu down. Make the changes you want and click the Done button.