<flattering comment> I really liked your FF light theme </flattering comment>
I think the theme looks nice, but the degradee doesn't feels good...
You go from light to dark and then from dark to light, but it looks like it were sunken in the middle (below the omnibar, but above the bookmarks) it doesn't fit with the buttons of chromium that usually looks a bit more raised..
The second version looks better to me, but it will definitively not fit with a lighter global theme, and even a for a dark theme it looks too black
(Ok, there are some darker themes like Tragedy from KDE, and that chromium theme fits it perfectly
I will go for the second, but it's my opinion...
<non constructive comment>
I used to like and use more darker themes, but I've realized that my eyes work better with lighter colors...
So, I'm giving you a very subjective opinion... Thats why I like more the FF light theme
</non constructive comment>
Your work always ends up very nice, so I'll keep an eye on it!