Like I said: "Seems a step backwards."

Cookie used to do this well - remove cookies with the browser open. Now it doesn't.
I open cookies and there all still there until I quit the browser.
Is this what I should expect?
Seems a step backwards.

I'm a recent convert to Mojave - Lord only knows why!
In any case, what is the expected behavior of Cookie 5.9.9 with Safari 12.1.1 under Mojave 10.14.5 ?
I added Cookie to the full disk access security panel as instructed. I am seeing, when Safari is quit, removal of all unwanted cookies. But, when Safari is open, Cookie no longer removes cookies - in spite of the preference instruction to do so. Is that what I'm to expect with this new OS from Hell?
If not, what do I change?
Thanks

So far, so good — 4.5 is working under ElCap. I have not seen the corruption issue so far.

Nice Work!