Edge

Download it on the Edge Store: https://microsoftedge.microsoft.com/addons/detail/sponsorblock-for-youtube-/mbmgnelfcpoecdepckhlhegpcehmpmji

Note: This version does not contain all translated languages due to a bug forcing me to upload individual images for every language. This is not worth my time, so I have only done so for the top languages.

Please download this version if your language is not supported.