How to quit all Finder tabs

I've configured OSX to force all Finder windows to open in tabs - because this really takes care of all the clutter. The thing is, there's a shortcut to close all Finder windows, CMD+OPTION+W - and this will conveniently exit and quit all Finder windows completely. But this does not work for a window with multiple tabs. I've searched Stackexchange and Apple Forums high and dry, and I cannot find a solution. I'd be interested in ANY WAY to achieve this, an AppleScript, a keyboard shortcut...EVEN a third-party app. Any help would be appreciated, thanks.