I use Cookies with Opera in Mac OS 10.12.6

The settings are that Cookies shall delete all non favourotes when the browser is closed, when Cookies is closed and when the Mac starts.
Wenn I close Opera nothing happens: all the cookies are where they were. When I close Cookies and reopen the program I see: nothing has happened, all the cookies are where they were. When I reboot the Mac I see: Cookies has deleted some cookies, but a lot of them are where they were before.

Or shorter: Cookies 5 does nearly nothing. Is this a bug or a feature?

I use the version from the AppStore. I installed the scripts. No difference. May be it works now with Safari, with Opera it doesn’t. Even if I click on »Remove non-favorites« nothing happens. The cookies sit there as before. That’s a really amazing piece of software. It does really nothing. But it looks nice...

It seems that Cookies 5 doesn’t delete any cookie. It doesn’t matter if I set it to delete the cookies when the browser is closed or at login and whatever: the cookies sit there and nothing happens. This was much better with the previous version, because it worked. Does Cookies 5 work in Sierra? (Even if I press »Delete all non-favorites« there happens nothing.)

I should mention that I just installed Sierra from scratch. Cookies is one of the first programs I installed after this.