When a youtube tab finishes playing its video, look for other youtube video tabs. If any are found, close the current youtube tab, select the next youtube tab and make it play its video.
Note that if there is only one youtube video tab open, nothing special happens when the video ends.
Add an option to control whether to close the tab when the video finishes, and an option to disable the extension on the fly, all from the extension bar. These features where mostly brought to you by an MR from **qsek**.
