xkcd-companion is a Chrome add-on that is specifically designed for fans of the popular webcomic, xkcd. This add-on provides users with the alt text and a convenient link to the corresponding explainxkcd wiki page for all xkcd comics. With xkcd-companion, fans can easily access additional information and context for their favorite xkcd comics.

The add-on seamlessly integrates into the Chrome browser, making it incredibly easy to use. Once installed, users can simply hover over an xkcd comic to instantly view the alt text and click on the provided link to access the explainxkcd wiki page. This add-on is a must-have for any xkcd fan who wants to enhance their comic reading experience with additional insights and explanations.

Please note that xkcd-companion is a free add-on developed by Sean Yeh and falls under the category of Browsers, specifically Add-ons & Tools. It is compatible with the Chrome platform.