Twitter Mastodon Linkifier is a Chrome extension developed by shuuji3. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This free extension aims to make Mastodon usernames clickable on twitter.com, allowing users to easily visit Mastodon servers without the need to manually type the name.

With Twitter Mastodon Linkifier, Mastodon usernames such as `@ and `other-mastodon-server.social/@username` are transformed into clickable links on Twitter. This feature eliminates the hassle of manually copying and pasting the usernames into the browser's address bar. By simply clicking on the Mastodon username, users can directly access the respective Mastodon server.

It's worth noting that this extension is no longer maintained. While it may still be functional, it is important to consider that there may not be any future updates or bug fixes. However, for users who frequently navigate between Twitter and Mastodon, Twitter Mastodon Linkifier can provide a convenient solution to enhance their browsing experience.