FYI the latest version of Sweet PO Production’s Cookie, an app which auto-deletes (or whitelists) cookies (and Flash ‘super-cookies’) in Mac browsers, just came out. I have been using it since 2013 to automatically delete cookies every 45 minutes. Before today the app had one paid upgrade in 2016. It’s currently in the Mac App Store (or from the developer) for $19.99, but if you already own Cookie 5 you can email the dev and get a discount coupon to buy directly from him. (I don’t know what the discount is yet; I am waiting to hear back.)
That price is admittedly a little pricey though - in 2013 I paid $8 for the app and later another $8 for the upgrade - but if the upgrade to v.6 is in the $10 range then it is a no-brainer for me. App has worked great for me for many years, and is regularly updated when new browser versions break things.