You can be identified through various methods that use the fonts in your browser to create a unique identity or fingerprint. This allows you to be tracked over time in the same browser.
One method is similar to Canvas fingerprinting where a web site will render a font in your browser then use the rendering to create a unique identity of your browser. This method can be sent for a loop with a technique we’ve implemented called scale spoofing.
Like canvas fingerprinting we’re basically messing with the rendering of the fonts to make each font fingerprint look unique per each session. The end result is that if someone tries to track you based on this method, every session and identity you use will appear to be a different person or browser.
To enable scale spoofing and combat font fingerprinting just go to Menu –> Settings –> Advanced –> Privacy and toggle the ‘Enable Scale Spoof’ option to ‘on’.