ニコ生サムネ消し is a free Chrome add-on developed by siranet36. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This add-on allows users to hide thumbnails on the Niconico Live homepage for specified broadcasts.

To specify the broadcasts for which thumbnails should be hidden, users can navigate to the extension page on the Chrome browser and click on "ニコ生サムネ消しの[詳細] - [拡張機能のオプション]." This will open the options for the add-on, where users can make the necessary configurations.

ニコ生サムネ消し is a useful add-on for Niconico Live users who prefer not to see thumbnails on the homepage for specific broadcasts. With its easy-to-use options, users can customize their browsing experience and focus solely on the broadcasts they are interested in.