Chrome extension to provide an icon in the browser toolbar, to toggle the option "Allow third party cookies". It switches between the settings to "allow all cookies" and "block 3rd party cookies".
https://chrome.google.com/webstore/detail/toggle-3rd-party-cookies/mjbgdmomkobioanhiklchdefppagojma
This chrome extension provides an icon to toggle the Chrome setting "Block 3rd Party Cookies". You can quickly deny or allow the web sites to set 3rd party cookies. This extension is intended, to allow 3rd party cookies on certain web sites, which do not work with disabled 3rd party cookies, but otherwise block them.