Change sidebar background color

First, themes do NOT solve this problem.

I want to change the background color of the bookmark- and history sidebar. Changing themes does NOT change that background color - at least none of the 100 or so that I tried.

I asked Google, but nothing seemed to match, which is strange, I'd think LOTS of people would ask this (I'm usually LAST asking for any GUI changes, I always use what is there without changing a thing, but this light gray background is a bad fit for most websites right next to it).

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