That is built in uBlock Origin. Click the eyedropper tool "enter element picker mode" https://www.dropbox.com/s/niy881lyaca4zmx/Screenshot%202016-01-28%2018.14

That is built in uBlock Origin. Click the eyedropper tool "enter element picker mode" https://www.dropbox.com/s/niy881lyaca4zmx/Screenshot%202016-01-28%2018.14.09.PNG?dl=0 https://www.dropbox.com/s/niy881lyaca4zmx/Screenshot%202016-...