Karamel is an innovative open-source extension for Firefox that enhances the YouTube viewing experience by integrating Reddit comments directly beneath the videos. This unique feature allows users to access and view all relevant Reddit discussions related to the video they are watching, fostering a richer engagement with the content. The extension provides a seamless way to switch between YouTube and Reddit comments using a conveniently placed button, allowing for a fluid browsing experience without leaving the page.

In addition to viewing comments, Karamel allows users to interact with them by upvoting, replying, and saving comments directly within the interface. The extension supports both dark and light themes, catering to user preferences. Moreover, users can customize their experience by changing the default comment mode and sorting methods through the options menu. Karamel is available under a subscription-based license and is open-source, making it a flexible tool for those looking to enhance their social interaction while watching videos.