How to turn new tab page off or on, problem here article on firefox support not works

i have read the article to set new tab page off on this link

i have used some add ons like viewmark,tab king,fvd speed dial . these add on have option to load in new tab and loading of them in new tab can be disabled through their options now i want to set my home page as new tab page, so it tried solution provided on above link but it not works, only blank page is loaded while i try both about:newtab, about:home(or prefered home page url) by entering in browser.newtab.url . how to set home page to new tab??????

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