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How do I prevent the new tab page resetting to default (blank) every time I restart Firefox?

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I have used about:config to set the new tab page to the Firefox start page (value = about:home) and clicked OK. But every time I shut down Firefox it resets itself to a blank newtab page.

I have used about:config to set the new tab page to the Firefox start page (value = about:home) and clicked OK. But every time I shut down Firefox it resets itself to a blank newtab page.

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browser.newtab.url change the value here