YouTube is definitely an awesome site for all kinds of videos. Every time you finish watching a video in YouTube, you need to manually replay it in order to have a look at it again. Auto Replay is a Firefox add-on which allows users to automatically replay YouTube videos without having to manually replay the videos once it is completed. This add-on adds an auto replay checkbox in YouTube video page along with options to choose the portion of the video to be replayed.
Once you have installed the add-on, when you open any video in Firefox, you can Auto Replay option on the right hand corner of the video. Here you can also select the time frame of the video you want to replay.
The add-on works very well with videos and there is no delay in starting the videos once it is completed.
Download Auto Replay Add-on for Firefox