This should be a standard YouTube feature.

Amazing add-on !!, should be implemented from the beginning. Thanks to the dev to update ;) Many thanks otherwise !!!
PS : Like said on the bottom, "previous chapter button" can be useful for some people

I love the idea, but lately it will only skip the first 4-5 chapters. If there are more, button does nothing....

It's awesome, but would be great if it also had a "previous chapter button" which feels like an oversight. I mean, youtube enhancer/regular youtube should already have this function so it's more their fault.