Launch all vids of a youtube channel

Credit : This pastebin is a copy of : https://www.reddit.com/r/LifeProTips/comments/247c2u/lpt_youtube_how_to_play_all_videos_from_a_channel/

Youtube used to offer a feature that allowed to play all videos from a channel as a playlist, just by clicking a button on said channel. This feature is now hidden, but still accessible by adding an URL parameter to the current page:
►open a video from the channel you want to watch
►add the following text at then end of the URL:
►    &feature=mfu_in_order&list=UL
►press enter
►you should now be viewing a playlist containing all the videos from the channel

if you dont want to remember that complex parameter, you can create a bookmarklet to automatically append it to the url of the current page. To do so, add the following code as a bookmark in your browser:

javascript:location.href+="&feature=mfu_in_order&list=UL"

You can set a keyword to your bookmark so you can use it more quickly. For example, is used "avc" (all videos from channel), so when I'm watching a video and I want to watch every video from that channel, I just type "avc" in the address bar.
I hope this has not been posted here yet, and that it'll be useful to some of you!