What is the point of removing video length from the thumbnail? If the entire thumbnail and video entry isn't removed, you still get spoilers via the video title. Works as described, but doesn't actually do anything useful.

Works as described.
Utilizing it per channel or for specific keywords is a great feature.
Other extensions I've tried have shown the progress bar for a split second when loading, but I have not experienced that with this one yet.

Easily the best addon of its kind. Being able to specify the channels means I don't have to hide the video lengths of videos where the length isn't a spoiler. The addon works instantly and perfectly.

does not work =\

I've tried all other add-ons here and this is the best one out there to not get spoiled.
Big Plus also on the superfast reaction on GitHub.