Please turn on JavaScript. Media requires JavaScript to play.

One in four net users now surfs the web on a Firefox browser which hails from the non-profit Mozilla Foundation.

With the support of thousands of developers, the open source browser has become a real challenger to Microsoft's Internet Explorer.

Mitchell Baker, the woman behind Firefox, told Click that customisation tools such as add-ons have helped it take on the competition.

She plans to adapt some of the best browser tools to create a personalised experience on mobile phones.