: Various "YouTube to MP4" extensions exist on Firefox Add-ons, but users often report mixed reliability, with some files downloading as corrupted. Troubleshooting Corrupted MP4 Downloads
: A free tool to re-encode the video into a standard MP4 format.
: Often plays files that standard players cannot.
: A tool often used for converting and saving video files. According to Yahoo , it is noted for being user-friendly, though it typically requires a paid license after a trial period.