Spoilers be gone! by Random Internet Person

Required permissions:

• Access your data for sites in the youtube.com domain
• Access your data for sites in the google.com domain
• Access your data for sites in the reddit.com domain
• Access your data for sites in the twitter.com domain
• Access your data for sites in the x.com domain
• Access your data for sites in the github.com domain
• Access your data for sites in the stackoverflow.com domain

Data collection:

• The developer says this extension doesn't require data collection.