For anyone that doesn't know, SponsorBlock is just a extension where someone marks a part of video as:
- Sponsor (/Ad)
- Self Promotion
- Interaction Reminder
- Highlight (to skip to)
- Intermission/Intro Animation
- Endcards/Credits
- Preview/Recap
- Hook/Greetings
- Tangents/Jokes
- Non-Music Sections (in Music Videos)
You can then set what it'll do for each caregory: auto skip, put a button you click to skip, color the seek bar, or obviously just do nothing but let the video continue normally.
It's so nice, I actually use it most for auto-skipping intermissions in recordings of live content these days... It even records how much in total: I've skipped 9688 segments (totalling 14 days 15 hours 3.5 minutes) since I installed it.