Color of folders

[hamis22]

Before updating to newer version bookmark folders were yellow as they should,but in current version they are white and there is no way to change that.This should be added to options so we could chose the color we want. 

[Jon]

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[igorlogius]

Maybe this is already doable with `userChrome.css`?

[Nich]

Change the color of the folders from gray to another, for example, to yellow, as it was before, or to blue, orange or turquoise.