Securing browsers is a full-time occupation, and someone (likely a small army of them) was busy at Mozilla before releasing Firefox 25 on October 29th. The bugs fixed relate to Javascript PDF usage, spoofing the address bar, image decoding, the offline cache, and various memory hazards (e.g. null pointers, non-deallocated blocks). Version 25 also adds a much needed gaming feature: Web Audio. The JavaScript interface to HTML 5 audio is now fully supported.