In the Location bar, type about:config and press Enter.
The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise! to continue to the about:config page.
Type browser.newtab.url in the search box.
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, for example google.com.
Click OK and close the about:config tab.
In bara de adrese scrie about:config si apasa Enter.
Apasa "I'll be careful, I promise!"
Scrie in search bar browser.newtab.url
Dublu-click pe browser.newtab.url si schimba tehtul de acolo cu about:home pentru Firefox Google home page
Click OK si inchide about:config tab.
Sursa: https://support.mozilla.org/......-top-sites
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