Domscriptions is a free Chrome extension developed by Borja Canseco. It falls under the category of Browsers and is specifically listed as an Add-ons & Tools subcategory. This extension allows users to easily mark their YouTube subscriptions by SHIFT+CLICKing on video thumbnails in their subscriptions feed, which will toggle tinting them a darker shade of color.

One of the main features of Domscriptions is its cloud sync capability, which allows users to persist their marked videos across different sessions and computers. Additionally, users can customize the color they want videos to be tinted with, providing a personalized touch to their YouTube experience. Another useful feature is the ability to use Domscriptions with multiple accounts, as logging into another account will not wipe the marked videos.

However, there are a couple of limitations to be aware of. Domscriptions only works with the grid view on the subscriptions page, and the list view is unsupported. Additionally, this extension disables YouTube's video preview on mouseover.

For those interested, the code of Domscriptions is open source on GitHub, and pull requests are welcome.

Overall, Domscriptions is a useful extension for YouTube users who have a lot of subscriptions and want to create their own visual cues.