Want to totally remove the new tab page feature in Firefox? With a simple about:config tweak you can get it done. Why would you want to disable the new tab page? For some people, it could be a privacy concern – and I am really happy that the Mozilla guys left in a trigger in about:config to get this done.
The first thing you will want to do is type about:config into your location bar, and then press the Enter button. If you get a warning, go ahead and click the I’ll be careful, I promise! button next.
Now, in the search box at the top – type in browser.newtab.url. Double-click the browser.newtab.url preference and change the url from about:newtab to about:blank. Alternately, you can change it to about:home for the Firefox Google home page, or type in your preferred home page
Click OK and close the about:config tab.