At last, a theme whose colors I like, yet it remains light enough so I can read all the tabs that I may have open!
I loved some of the other themes, especially those with birds or cats, but they always came up so much darker than they looked in the list of themes when I chose them that they annoyingly obscured the lettering in tabs.
Yes, I tried going to Tools>Settings>... and way at the bottom of some page, switching from "automatic" to "light," but the themes were not affected in the least. It's disappointing.

Very nice subtle colors and Very Readable firefox Text!

I Like the pastel colors.
For me, pastels aren't overbearing like some themes with non-pastel colours!😕😑

Perfect. Gives subtle coloring to the tab line while leaving everything else alone.