UnTube

Tired of YouTube ads? What about suggestions and the fact you're unable to watch just one video? Then this add-on might be for you.

This add-on hides ads (always) and video suggestions (optional, you can toggle them back).

>> Functionality
Modifies the YouTube page doing the following:
** Hides every single ad right when they appear, including the (in)famous "Skip in..." one (if you find any new ad, please let me know)
** "Blurs" all video suggestions (toggleable)
** Hides suggestions at the end of the video (toggleable)
** Blocks redirection to next suggested videos (toggleable)

>> How it's done
For a technical explanation, check this add-on's website.