I'm kinda sure I saw a pre-chromium Opera browser build do this back in like 2010 or so (maybe it was just a mockup), but like you say, it's not super intuitiv

I'm kinda sure I saw a pre-chromium Opera browser build do this back in like 2010 or so (maybe it was just a mockup), but like you say, it's not super intuitive. And the scrolling feels weird when you have 2-3 columns moving.