Comment by mFixman

I have been successfully using the Consent-O-Matic extension [1] to auto-decline all cookie and GDPR banners. As much as I'm not comfortable giving potential access to every website to some extension developers, this improved my internet experience almost as much as AdBlock.

Does anybody here know of a better solution?

[1] https://addons.mozilla.org/en-GB/firefox/addon/consent-o-mat...