Better question here is, why is this not handled through the browser instead of relying on individual web apps to do it.
Block third party cookies by default, delete other cookies on the last tab or window closed and prompt user to save cookies on a form submit ("do not delete cookies for this domain when leaving" type of prompt, for pages with logins, settings, etc).
Also remove features that make easy fingerprinting possible, the site doesn't need to know every font I have installed, just have a "standard set" included with the browser, and use web fonts or whatever for other fonts.
Block third party cookies by default, delete other cookies on the last tab or window closed and prompt user to save cookies on a form submit ("do not delete cookies for this domain when leaving" type of prompt, for pages with logins, settings, etc).
Also remove features that make easy fingerprinting possible, the site doesn't need to know every font I have installed, just have a "standard set" included with the browser, and use web fonts or whatever for other fonts.