When you visit a web page, your browser voluntarily sends information about its configuration, such as available fonts, browser type, and add-ons. If this combination of information is unique, it may be possible to identify and track you without using cookies. EFF created a Tool called Panopticlick to test your browser to see how unique it is.
Modern web browsers have not been architected to assure personal web privacy. Rather than worrying about being fingerprinted, it seems more practical to use free software plugins like Privacy Badger, uBlock Origin and Disconnect. They not only respect your freedom, but your privacy also. You can get much further with these than trying to manipulate your browser’s fingerprint.