The extension you are looking for is "Sponsorblock". It crowd sources timestamps to auto-skip intros, ad-reads, credits, etc and is pretty customizable.
Sponsorblock instantly 'broke' video for me; I feel incredible discomfort watching any video without it. Amazing extension.
Such is its utility, this single extension lifts youtube as a platform higher above tv or or native video players on other sites which don't have any sponsorblock capability.
Such is its utility, this single extension lifts youtube as a platform higher above tv or or native video players on other sites which don't have any sponsorblock capability.