Firefox Disable / Hide New Tab Page:

HowTo: Turn this feature off completely

In the Location bar, type about:config and press Enter:
about:config
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:
browser.newtab.url

Thank you.

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