From some time websites implemented new tricky way cookies, there are new options called somehow like ‘justified interests’, which you need to clilck one by one. Is there any addon on firefox which would disable them by default?
Why not just use Cookieautodelete or private browsing in firefox and all cookies will be deleted everytime you restart your browser?
You can enable clear cookies on exit or site blencher addon
I don’t have a good (verified) answer. But you can try to search for “consent” at addons.mozilla.org - there are a few addons which might help. but I guess you would have to do a lot of testing, to see what exactly those addons do. and if it helps or not.