Pretty much a must-have extension for anyone that frequently uses Youtube. It's heavily customizable with plethora of features.
It's a worthy successor to addons such as Youtube Plus and Youtube Center.

V. 2.0.119 Fixed all the previous problems. Great addon!

please help, the expand feature did not work, it only zooms the video but the video player did not expand through the whole window

edit: fixed already

Completely stops working if I disable the "Block adds" feature

In version 2.0.119 the issue with "Expand" and "Cinema mode" are fixed. Just need to wait untill Mozilla approves this update.

A must have for YouTube, really, has more than any other add-on

The extension is a bit messed up as of a few days ago, but it is ultimately the best YT addon out there so I'm here to support it.

Amazing addon, but youtube has one again ruined a feature with its needless updates. The theater mode doesn't work, with the title coming through the bar at the bottom of the video.

Would be 5 stars, but the "expand" function and themes recently stopped working

edit - 5 stars now, issues resolved

Really a shame that Mozilla took such draconian control over extensions, without the manpower to actually administer it, and made it so that developers can't push timely updates

Youtube broke the UI again, it is not the author's fault. This plugin works great always 5 stars

5 stars cause i love this addon and im looking forward to the theatre mode fix! :D

absolutely brilliant, checking up on this for the fix and decided to finally leave a well-deserved review :)

Thank you maxime for this amazing add-on, hope the updated version is released soon

Would be fantastic to allow a mousewheel "scrub" (move through video) option e.g. when cursor is placed over timeline

Essential extension for Youtube viewing. Actively maintained and the dev does a good job keeping up with Youtube changes.