Horizontal scrollbar for browser?

In vertical split view, I find myself constantly resizing the browser pane to see inside nested groups – a really awkward process given that it always takes a few moments to grab the edge of the pane. Ideally I’d like to keep the browser pane at a fixed size, and use a horizontal scrollbar to navigate left and right. Anyone else think this would be a good idea? Couldn’t be too hard to implement, could it?