It's complicated. There is in fact a hidden option that makes the web browser less unique, but using it has side-effects such as retrieving pages in English wit

It's complicated. There is in fact a hidden option that makes the web browser less unique, but using it has side-effects such as retrieving pages in English with UTC timezone, noticeably reducing the browser view point size, breaking WebGL, break some JavaScript using <canvas> and most notably, making the web browser noticeably slower. It's not something that a web browser can afford to have without informing the user of the consequences. Not to mention without additional measures, this is unlikely to help much against fingerprinting. You are probably better of using Tor Browser.