Use a vpn with a Eu server. More sites like google will show a cookie popup with the “reject all cookies” option.
Reject all cookies if it exists. Otherwise accept cookies and then click on the :
shield icon > cookies and site data > delete (trash icon)
This is super useful when you want to read an article on some news website and it shows a cookie popup.
Just whitelist the ones you want to keep. Pretty sure Firefox now let’s you whitelist, I use a plug in because I’ve been doing it that way for years (ie before ff had the option)
Wait, foxfire does it natively now? I’ve been installing cookie autodelete for years
Deleting cookies on close? I had my Firefox set up to do that about 20 years ago