Firefox is a free and open-source web browser used by over 200 million people worldwide. It is highly customizable, supports many languages including Thai, and is constantly being improved with over 15,000 enhancements since version 2. Thai support has increased over time through the work of volunteers to localize the user interface and fix issues like improper word wrapping. The latest version is 3.0.2 and future versions will bring additional performance and standards improvements.