Github Enterprise has always had the black header bar.
If Github keeps the black header bar for both, it will be easier to accidentally be working in the wrong Github.
For those who want to try on firefox:
1. clone the repo
2. about:debugging. Load temporary -> select any file in repo
BTW, did you not figure any other way other than setTimeout() ? There is a flicker because of that.
Really life will change, we will all come and go, getting too attached is the basis of all suffering.
EDIT: Explained myself
It makes me at first worry am on a phishing site.
GitHub, go with any of these(give us an option at least)!
Black+Cyan
Blue+Orange
Cyan+Yellow
Grey Paper+ White