Google Chrome is currently most widely used web browser available in multiple platforms. It has a robust extension system well integrated into it.

Maxthon is a freeware web browser developed by the company Maxthon Ltd.

iCab is a web browser for the Apple Mac.

Opera is a one of the major web browsers with good extension functionalities.

Sleipnir 3 is the Web browser created for users to make use of both their Windows / Mac desktop and smartphone device.