On OS X, Command-left bracket has worked on Chrome, Safari, Firefox (and probably more) for years. Not sure about Windows or Linux, but keyboard shortcuts are v

On OS X, Command-left bracket has worked on Chrome, Safari, Firefox (and probably more) for years. Not sure about Windows or Linux, but keyboard shortcuts are very well established across browsers in this way (like Command-L, and all of the Emacs bindings like Control-A, Control-E, etc.).