But in 2014, after being appointed CEO of the Mozilla Corporation, he found himself at the middle of a firestorm. Eich had donated to Proposition 8, a failed Californian ballot initiative that aimed to define marriage as between one man and one woman. When news of the donation became public, he was highly criticised, and ultimately resigned from the role.  

Eich is now launching a new startup, called Brave, that aims to "fix" a problem with the modern internet — adverts.

Advertising is sick, Eich says. It's intrusive, tracking users with "cookies, tracker pixels, fingerprinting, everything," and slowing the internet down to boot — and as a result, users are increasingly turning to ad blocking software to eliminate them altogether.

Eich's solution: A new web browser that blocks all adverts by default — and then replaces them with new ones.