This app will only work with "Accept Third-Party Cookies - Always" enabled. I do not have and will not enable Third-Party cookies. I do accept cookies for all my sessions. I've added an Exception for www.evernote.com to 'Allow' for this website, but that still will not allow the Evernote Clipper for Firefox add-on to work properly. I still get the message that third-party cookie must be enabled. Unless I can get the 'exception' to work for Evernote in my Firefox Privacy Settings, or when Evernote Web Clipper will work with 'regular' normal cookies enabled, I plan on disabling this add-on.