I came here to share that bright white context menus and scrollbars were the biggest 'theme-breaking' aspects of Vivaldi on my darkened KDE linux system that I want to see fixed.
For those looking for an immediate workaround, I tested a number of extensions and this extension gave me the absolute best scrollbars: https://chrome.google.com/webstore/detail/modern-scrollbar/bgfofngpplpmpijncjegfdgilpgamhdk
The other scrollbar extension that was linked earlier was horrific - you couldn't even enter a custom color hex code, you were stuck crudely eyeballing a color selection tool to match your theme and I wasn't having it.
If anybody has a work-around for context menus, I would be happy to learn of it.
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Very very good feature request. Actually, in Opera 12, advanced theming - to be more precise, the fact that in the first weeks of me using Opera 12, I found a very good theme that made me stick with it enough long until it became my default browser, still long after death. This type of theme customisation is very very important to make people stick to the browser, and feel that they are using that is customized for them.