StereoToMono is a Firefox extension designed to transform audio and video playback into a mono output with ease. With a simple click on the extension icon, users can combine audio from both left and right speakers, ensuring a balanced listening experience. This feature is particularly beneficial when dealing with unbalanced stereo images or when only one speaker is available, allowing users to enjoy full audio without missing any sound elements.

The extension operates seamlessly across compatible audio and video elements on web pages. Users can set the audio preferences for their current Firefox session, making adjustments straightforward. However, users should be aware of potential limitations, such as compatibility issues with certain pages or interference with other audio-altering extensions. For optimal performance, it is advisable to reload the page after making changes to the audio settings.