That’s not really possible if the server does anything sane to authenticate the cookies. All you can do is log in the hard way, then save the cookie you get in the hope of re-using it later.
Yeah, any authentication cookie will be unique to you, so if you do use one, Google will be able to track you across browsing sessions, which is likely what you’re trying to mitigate by clearing them.
Thought about something like a cookie repository, addon loads a random cookie from it, Google track it through that tab, new tab the addon loads a different random cookie, etc. But other comments are saying it’s not possible so ok.
That won’t work.
The best you can do is clear your cache and history every time you close the browser and use some kind of containerized system like the Firefox plugin.
What you’re asking about is fundamentally not how the web is designed.
E: and of course close the browser when you’re done looking at the website.
