Adaptive Tab Color
ATB doesn't offer much of a color palette besides the websites background-color as an accent, and some iterations of blacks and whites, which end up looking extremely bland. This is about the best it will get.
Best Compatibility
This extension configuration seems to offer the best compatibility (You can changing it later)
Some extra configurations, you may find useful.
By @flick36
While tinkering i found out, in the Adaptive Tab Color extension, that you can actually disallow a light tab bar, which i think it's a nice setting to have to kind of "fix" the problem of having different shades of dark or light themes, i believe most of us prefer a Dark Theme, so unticking that setting works flawesly, also, notice the "minimium contrast" bit ont the same extension, the default is 4.5 for dark, ik set it up to the max which is 21, and onw i get a full black when using a website that has a light theme
^ This is Using Adaptive Bar Color Extensions + Dark Reader + Disallow Light Tab Bar + 21 minimium contrast for Dark
^ This is Using Adaptive Bar Color Extensions + Disallow Light Tab Bar + 21 minimium contrast for Dark
^ This is Using Adaptive Bar Color Extensions + 21 minimium contrast for Dark (gets ignored because it's a light theme)
^ This is Using Adaptive Bar Color Extensions + Disallow Light Tab Bar + 4.5 minimium contrast for Dark (default)
^ This is Using Adaptive Bar Color Extensions + Dark Reader + Disallow Light Tab Bar + 4.5 minimium contrast for Dark (default)