This Chrome extension allows for fast fetching of a YouTube video's thumbnails. It gathers all possible thumbnail variations and presents them in a clean and simple way.
To run the extension in it's current form, download the repository and then head over to the Chrome extensions menu and select "Load unpacked extension...". From there on all you have to do is select the repository folder you downloaded. You should then see a new Chrome extension beside your omnibox.
This repository is released under the MIT license. For more information please refer to LICENSE