Been using it for years, the single best extension I've had. could not recommend it enough.
I've been saved 1d 21h from user submitted segments and saved others 1d 8h.

SponsorBlock is a lifesaver for YouTube! It skips those annoying sponsorships, and I love it. Super easy to use, and it saves time. Can't watch YouTube without it now. Five stars!

Improves the YouTube experience SO MUCH. Cannot live without it any more.

not currently working on youtube 9/11/23

edit: youtube video is removed from the page and a generic "adblockers aren't allowed" banner is in its place. no way to remove it, and seems the video is not actually present. i'm in ontario.

Was introduced to this extension by the original YouTube Vanced team. When I made a Firefox account, i dashed to get this extension as well as other extensions and compiled it into a custom add-on collection.

SponsorBlock team, if you're reading this, here's the info on my collection that you can add to your Firefox Beta's and Nightly's on your phones and tablets and try it out:

User ID: 17588160
Name: Sprinkle-Bally-s-Add-Ons

really smart, already saved me 7 hours.

Latest version seems to "forget" to skip sometimes, can't figure out what causes it, seems random.
On another note, You should add a 'spoiler' category for game\movie\tv show reviews and stuff.