You can set any webpage as your homepage, and have it shown when you open a new window or a new tab.
First open up Safari and n the menu bar in the upper part of the screen, click the safari menu option.
In the preferences window click the general tab on the top
of the window. Then look for the set to current page button. If you click that
it will change your homepage to the current website that safari has open.
After clicking the button, the address in the “Homepage” field will change to the address of the current page.
If you want your homepage to up when you open a new tab. In preference window and the general tab change the drop
down menu for “new windows open with and change it to homepage.