For those, like me, who routinely delete cookies and browsing history at the end of every session, there is an add-in/extension for Firefox, Chrome, Opera and Pale Moon which will remove cookie warnings from most (note the word most) sites. It's called I Don't Care About Cookies and their web site is
https://www.i-dont-care-about-cookies.eu/
For those who use the extension-which-should-not-be-named there is a filter subscription list which blocks the EU cookie notices for a lot of sites (I have not tried this one though). It's called Prebake and their web site is
http://prebake.eu/