Using SumTingWong solution and click on easy accept button, or
accept Cookies on your sites with their provided cookie management solution and don't clear cookies. Ignoring / hiding with extension will end in same behaviour as "accept all"
I use Easylist's Cookie List. It doesn't work for all sites and sometimes results in site breakage, but it hides the notices for the majority of sites I visit.
I also haven't encountered a scenario where using the filter accepts the cookie notice, as turning off the filter always results in the cooking notice reappearing, which it wouldn't do if it had been accepted.