Look at gif. Enabled Dark Reader extension. When the page loading, blink white screen. Is there any possible to change it to dark? All solutions that I found didn't work today.
There is an extension that protects against this: WhiteSlash - White background flash fix.
WhiteSlash is a fix for the white flash in chrome that is shown whenever a link is clicked or a new tab is opened before the page fully loads. Protect your eyes and use this extension combined with Dark Reader.