Twitter Unseen is a lightweight extension called "Twitter Unseen" that allows you to block the "seen" mention on Twitter's private messages. With this extension, you can disable the feature that indicates when someone has read your direct message.

Whether you're using Twitter's main website or TweetDeck, Twitter Unseen will work seamlessly to hide the "read" mark on your messages. This can be particularly useful if you prefer to maintain your privacy and not let others know when you have seen their messages.

The extension is easy to install and use, making it a convenient tool for those who want to browse Twitter without the pressure of acknowledging every message they receive. With Twitter Unseen, you can enjoy a more discreet messaging experience on Twitter.