It looks jarring to have a top bar that has such a high contrast with the rest of the page. Not to mention the color palette used is very...odd. Very off white and pure black (255, 255, 255) do not go well together. They could have at least made the entire site dark themed in which I doubt there would be so much drama around it.
Edit: also 255,255,255 is white, not black.
The text is 0.75 white. The header background color is explicitly set with hex.
At first I assumed this was part of an incremental change to go fully dark, although I'm not sure why they would release it part by part.
But then a tweet  seems to imply that it's not gonna happen anytime soon.
White means, anything you do here is publicly visible.
Seriously github.com can we please use the black to give some meaning.
I don't want my public repos to have black headers.
Most of these extensions popping up that revert GitHub's header to white are simply removing the `.header-dark` class which (currently) applies the dark styles and according to @mdo the styles will be permanently applied as a default.
The only way to revert them after this would be to reapply the old styles so if someone really wants that they might want to save them now.
I'm saying that Github is going to apply the dark styles by default soon (without the modifier class) and the only way to revert the header will be to rewrite the old styles.
Made a Gist with the styling that will revert the black bar to it's original light grey header.
And the Stylish addons can be found here:
Even if the end design is objectively worse than the previous/current one, it will feel better compared to the intermediate versions. That might make the users actually complain less in the end.
1) Black Bar: General Github stuff
2) White Stuff: Repository Specific Content
Now, if they could only put the link to the releases section in a place where you can find it, that would make the page perfect.
The search input to search in the current repo is still in the black bar.
My favourite of that bunch makes the navbar just slightly lighter instead of switching back to the old style: https://userstyles.org/styles/138757/better-dark-github-nav