Stylus - Userstyles Manager (by openstyles)Project mention: YouTube: Filmmakers Presumed Guilty Until (Maybe) Proven Innocent | news.ycombinator.com | 2021-10-18
That github page links to the dodgy extension "Stylish".
The better one is called Stylus. The main difference being "Any and all analytics, telemetry, and data-collection have been removed completely. We'd rather not know what you're up to."
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