Dave Camp, Director of Engineering this week announced that the company is currently in the process of redesigning the program's user interface tourς Mozilla Firefox.
The new use interface (interface) will be rebuilt using modern ones websites technologies and techniques where it was originally built with the programming language XML User Interface Language (XUL). Unfortunately the programming language XUL has been overtaken in the internet, as over time the internet and applications have improved quite technologically, which is important for the future plans of the browser and its performance.
Source: Mozilla, thegreeksenergy.com