I read the headline and I'm like huh... because I'm also experiencing exactly this, on my 2019 16" MBP, with Firefox. It only occurs on or around the tabbar. Fi

I read the headline and I'm like huh... because I'm also experiencing exactly this, on my 2019 16" MBP, with Firefox. It only occurs on or around the tabbar. Firefox has its own desktop space on my Mac, and the graphics artifacts haven't been occurring on other desktop spaces. I hadn't made the connection to the browser, figured it was a problem with the window manager or something. I'm also more or less permanently in dark mode.