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Don't. It's been acquired. Use the community fork: https://addons.mozilla.org/en-US/firefox/addon/istilldontcar...

You can already do this with uBlock Origin: Just go into the (uBlock Origin) settings and enable the AdGuard and EasyList stuff under "Annoyances".

"AdGuard – Cookie Notices" and "EasyList – Cookie Notices"

That's only cosmetic filters (or at least it used to be). "I don't care about cookies" or the open source fork "I still don't care about cookies" also clicks the buttons to accept/refuse.

The best one seems to be Consent-O-Matic as it actually tries to disable all trackers, but it doesn't work on some sites/popups.

I was scratching my head why I'd want addons at all (running DNS66 on the phone, so no need for an adblocker.) but this is honestly a great idea. God how I hate the cookie banners.