Since a month now, the banner of both the main site and the Meta site have this strange effect (a dithering problem?):
It is more apparent on the right side:
I'm using Firefox 83.0. In Edge there is no problem. I don't have Chrome to test it.
Using the Inspector, the problem seems to be (the positioning of)
background-image: url("img/header-background-image.svg?v=fe2fd5316ad9");of the .site-header class. The image seems to be drawn using a simple block of pixels.
The Dark Reader plugin I use is not the problem.
Other plugins I use only block scripts (AFAIK) and shouldn't influence the drawing of static images.
Does anyone else have this problem, or a potential fix?