Try to Reset your search

• https://addons.mozilla.org/en-US/firefox/addon/searchreset/

Type about:config in URL and filter

• browser.newtab.url and change the value as about:newtab

Thanks, the about:config thing worked great!

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Hi,

I didn't understand where I should type about:config in URL and filter for after as you say to do

   browser.newtab.url and change the value as about:newtab 

Could you please be more precise. I'm a beginner

Thanks a lot Ateneu