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How can I change background color of page before loading starts?

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  • 2 have this problem
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I tried adding style to userChrome.css

@-moz-document url-prefix(about:blank) {

   * {
       background: black !important;
   }

}

and https://support.mozilla.org/en-US/questions/1106886 but both did not work. Dark mode extension works after loading a page but not before loading page in new tab.

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