Right clicking is not as friendly as a quick button, like the suggested one in sidebar. I´d love that feature too.

Well, I agree about the address bar. Makes more sense than side bar. But I believe this button should do the same as the context menu, only for the current tab. Usually we have a preference we want most of the time, and a quick button helps for the exceptions, like pages not rendered well with the force dark.
At least this is my personal preference.

Right clicking is not as friendly as a quick button, like the suggested one in sidebar. I´d love that feature too.