Here’s a helpful write-up for using — covering its built-in capabilities, supported formats, tips for improvement, and troubleshooting. 🎬 Using Firefox as a Media Player: A Complete Guide Firefox isn’t just a web browser — it can also function as a lightweight, capable media player for many audio and video formats. Whether you want to play a local file, stream online content, or test media playback, Firefox has you covered. ✅ What Firefox Can Play Natively Firefox supports the following media formats out of the box (no plugins needed):