Yeah, I use Stylus and Dark Reader, but they shouldn't have anything to do with these flashes. "Use custom background color for web pages" is like using a sledgehammer on a thumbtack, and creates more problems than it fixes IME.
I imagine whichever method you're using for the initial redirect is the problem. In Chromium, if there's a delay for whatever reason, links opened in a new tab flash whichever color is defined in the theme for "ntp_background". These redirects should do the same.
I imagine whichever method you're using for the initial redirect is the problem. In Chromium, if there's a delay for whatever reason, links opened in a new tab flash whichever color is defined in the theme for "ntp_background". These redirects should do the same.