Cookie Cutter GDPR Auto-Deny v1.4.5
This addon automatically denies access for all optional cookies in supported sites that provide a GDPR-style prompt for setting that option.
The default site list at time of writing includes all stackexchange related sites (stackoverflow, etc.), zoom.us and ikea.com.
For websites which are not in the default ruleset, you as a user can configure support for them with just a few using the "Configure this site manually" option. If you do this I encourage you use the settings page to submit this custom rule to me so I can get it added to the default ruleset in future releases :)
Also included is a per-website whitelist; if a site is whitelisted you will see its option dialogues as if cookie cutter GDPR auto-deny were not installed at all.