New Tab button brings up Yahoo, want a different page First I would identify everything in about:con

New Tab button brings up Yahoo, want a different page

First I would identify everything in about:config that refers to Yahoo.

Then I would remove everything about the Yahoo toolbar that is left that you don't want.

https://support.mozilla.com/en-US/questions/850287

As a replacement for browser.tabs.loadOnNewTab (Bug 269664), you may have installed: New Tab Homepage [-- https://addons.mozilla.org/firefox/addon/777 --] (7KB), or NewTabURL [-- https://addons.mozilla.org/firefox/addon/2221 --] (47KB).