Users can mark YT video segments as sponsored (this video brought to you by raycon), etc. Other sponsorblock users will automatically skip those segments during playback (also highlighted on the timel
This looks very interesting. I looked at the "add-ons" page for Firefox and noticed under permissions it said "Access your data for all websites". Why would it need to access all websites? Why not just when you access YouTube?
Might just be how the plugin API in Firefox works. I haven't looked, but maybe plugins don't specify that they access a specific site, just that they need site access.