Canvas Blocker - Fingerprint Protect is a free and simple browser extension that helps protect your privacy by preventing the HTML canvas element from generating a unique identification key to protect user's privacy. It does this by adding a slight noise to the data generated by the canvas element when certain methods are being called. The noise is added in such a way that it won't affect the integrity of the data, but it will prevent the canvas element from being used for fingerprinting purposes. 

Apart from that, it also helps you to block fingerprinting from all frame elements (top and subframes). It is a lightweight and efficient extension. It is designed to be used on all websites.