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).
Wšykne wótegrona (3)
This code in userChrome.css will do that. Change the color code to what you want.
#bookmarks-view, #historyTree { background-color: #DDDDDD !important; }
http://www.w3schools.com/cssref/css_colors.asp
http://kb.mozillazine.org/UserChrome.css
This add-on makes it quite easy to work with the 3 "user" files.
http://webdesigns.ms11.net/chromeditp.html
Those sidebar colours do change with themes for me. Bloody Red sidebar looks very different from Walnut 2 sidebar, for instance.
Note that themes currently cover what used to be a persona and only style the toolbar area.
You may need to check out complete themes.