I do this all the time by just dragging a tab off so it's a second window (and hitting a key in my wm to make them side-by-side). The only problem is that the address bar turns so tiny it's impossible to read it among all the pointless icons that should've been in the overflow menu, I wish there were a way to make it prioritise showing the url instead of icons for "bookmark this page" and "certified by digicert" etc.