use this add-on:

https://addons.mozilla.org/en-us/firefox/addon/newtaburl/

thank you

Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

A new tab opens by default as a blank tab (about:blank).

If that isn't the case then an extension has changed that behavior.

• https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

You can middle-click or hold down Ctrl and left-click the Home button on the Navigation toolbar to open the Home page in a new tab.