X Message Preview is a Chrome extension designed for users of X (formerly Twitter) who wish to read messages without marking them as "read." This tool enhances the messaging experience by allowing users to hover over message boxes to reveal the most recent message in the thread, making it easier to manage conversations discreetly.

Key features include the ability to read long messages that automatically adjust to fit the screen, ensuring a seamless reading experience. However, it is important to note that the extension can only preview text that is currently loaded on the page, and it does not have access to previous messages before the most recent one. This tool is a useful addition for those who want to maintain their message privacy while staying informed.