Thanks - this is useful indeed but it is sort of a hobbled view - I don't have access to the extensions I have installed in the side view. E.g. the main view shows the page in dark mode via dark reader but the side view doesn't have access to the extension so it has white background which is very jarring (better than nothing though). I wish they allowed a full-on split - almost like having two browser windows (with a common menu/bookmarks bar that acts upon the "active" pane).