No Summary For You! от Tim Andersson

Hate getting TV show episodes or movies spoiled when browsing Netflix?
Use No Summary For You! to hide summaries and synopses on Netflix. You can easily reveal the summaries you actually want to read by hovering your cursor over them for a little while.

If you're in a scenario where you want to see all summaries (e.g. when browsing for a movie), use the toolbar button to temporarily disable the add-on and reveal all summaries.