Messenger Notification Sound Changer is a Chrome extension that allows users to personalize their notification sounds for Messenger.com. With this tool, users can easily upload their preferred audio files, replacing the default notification sounds with custom selections. The process is straightforward: simply install the extension, upload an audio file, and refresh the Messenger tab to hear the new sound.

This extension also supports dark mode, adhering to the user's browser preferences, ensuring a seamless visual experience. Importantly, all uploaded audio files are stored locally on the user's device, prioritizing privacy and security by keeping data away from external servers. Open-source under the GPLv3 license, it encourages community involvement and transparency in its development.