i hope you understand the inherent irony of your second suggestion, but if you missed it: I Don’t Care About Cookies just got bought by one of these companies known for similar types of abusive UX (surveillance-ware).

There is a fork by the community "I still don't care about cookies" (note the "still") that should avoid any evil stuff Avast would do to the original extension.

But, of course, you have to be a savvy enough, and informed enough user to even know this.

Same in Chrome, it's great: https://zapier.com/blog/block-notifications-chrome/

If you're going to install add-ons, just get them uBlock Origin and enable all filter lists. The "annoyances" lists block all the cookie madness.