YourCodecs is a Firefox extension designed to enhance video playback on YouTube by allowing users to select specific codecs to use. This tool is particularly useful for those experiencing performance issues, such as freezing or overheating, when playing videos. It supports multiple codecs including H.264 (AVC), VP9, and AV1, giving users the ability to block unwanted formats that may cause problems on their devices.

The extension features a dark UI and supports both English and Traditional Chinese languages. Users can selectively block codecs like AVC, VP8, VP9, and AV1, and there is an option to disable 60 FPS playback if desired. It's important to note that blocking all codecs will prevent video playback entirely, as YouTube will indicate that the browser cannot play the video. For optimal performance, users may need to refresh the page using Ctrl + F5 after making codec selections.