GreenBrowser is a web browser developed by MoreQuick. Although the browser market is fought furiously by the likes of Internet Explorer, FireFox, Safari and Chrome, there are still small independent browsers to be found, and GreenBrowser is one of them.
The setup file is less than 2MB big, and with this size you get a fairly quick, multi-tab browser. It has loads of good customizable settings, however, some other stuff is not customizable, such as the way new tabs are opened. It is certainly not competitive with such browsers as Firefox, for example, as there is no support for plug-ins or any other add-ons. In fact, the only thing the browser performs is just web-browsing, quick and simple. It is noticeable, that there is no indication why this browser is "green", it is still compact and quick.
The interface might be a bit unattractive, that depends on your taste, but it is intuitive and simple to use.
In the end, there is no big reason to switch to GreenBrowser, unless you are looking for a non-mainstream browser to use.