They've been around a while. Here's the top Google Result: https://chromewebstore.google.com/detail/canvas-fingerprint-defend/lanfdkkpgfjfdikkncbnojekcppdebfp?h

They've been around a while. Here's the top Google Result: https://chromewebstore.google.com/detail/canvas-fingerprint-defend/lanfdkkpgfjfdikkncbnojekcppdebfp?hl=en https://chromewebstore.google.com/detail/canvas-fingerprint-... I think Privacy Badger may also do it.