How to enable side tabs in Google Chrome
Like so many new Chrome features, side tabs are hidden behind a command line flag: --enable-vertical-tabs. As always, if you need help figuring out how to add a flag, have a look at our how-to post! Once you've done that, simply right slick on your tab bar and choose use side tabs.
App tabs and pinned tabs appear at the top of the list and you can still drag and drop to re-order tabs and right-click them to pin, close, duplicate, or reload. As Martin points out over at Ghacks, there's some graphical weirdness when you first activate the switch. Give Chrome a slap by opening a new tab with ctrl+t or simply minimize and restore the window.
Remember, you need to download and install either the Google Chrome dev channel build or a recent Chromium snapshot.