Infinity for Youtube

This extension hides video duration on youtube videos, in order to avoid spoilers.
Unlike existing similar extensions, this doesn't hide the duration for all the videos, but only for the videos in the selected YouTube channels.

Hiding the video duration is currently working in:
* the video player
* the recommended videos on the side-bar
* the YouTube homepage
* the search page
* a user's page.

You can select the channels in which to hide the video length in the extension's options page.