Vertical tabs preview now available in the Canary and Dev channels

William Devereux, love the feature. Now that I've been using it for a while, I find that I turn it off when only using a few tabs, then turn it back on when I get enough tabs at the top that they start graphically compressing to make them fit and I can't read enough text to tell what they are (often have several tabs with the same favicon, so the icon alone doesn't help). This has led me to realize I would like to have it use horizontal tabs at first, then vertical tabs as an overflow when the title bar is full. I realize not everyone would want this, so I'd ask that this be an added option with Vertical tabs: something like "Use Vertical tabs as overflow".

From a UI consistency perspective, we already have something like this with the Favorites Bar: all new added Favorites appear in the bar, until it's full, then they wrap into the vertical drop-down. In that case, there's a drop-down for the excess Favorites. With tabs, I think it should be always visible, exactly like a you've done it now.