Cookie Monster is a great little freeware program that I have used for years. Any time you click on its icon, it oppens and lists all the cookies you have collected.You can delete them all with one click. It also lets you keep a list of “reserved cookies” of ones you want to keep.
It will not work if a browser is open. I use Firefox. All of a sudden the other day, when trying to open it, I get a message that it can’t open until the browser is closed. It was closed, but I went ahead and closed Thunderbird too, just in case, but no help. It lists all my preserved cookies, but won’t show new ones.
I uninstalled and reinstalled it, but the same thing keeps happening. Anybody else experience this?
Any solution?
I did find that they have a nice Add-On Cookie Monster for Firefox, which I am using, but the old one was really much better and eazsier to use.
Did you reboot when you uninstalled and reinstalled it?
Have you looked in task manager to see if a firefox task is actually still running in the background? Firefox seems to lose track of threads on occasion and keeps something running in the background. If you’ve closed all of the firefox windows and you still have a firefox task running (after giving it some time to exit on its own) then you can safely kill it from the task manager.
Has firefox updated itself recently?
To ask the obvious, possibly stupid, question: you tried rebooting the computer, right?
From my experience, Firefox will sometimes hang when closing. The easiest solution is just to reboot. Either that, or go into Task Manager and manually kill it.
Thanks for the suggestions, but have pretty much done it all. I have re-booted many times, as this has been going on for a week or so. I shut down the computer entirely each night as usual.
I did check Task Manager right away, and no sign of Firefox still running.
I also sent an email to them, but as it is freeware, did not really expect a reply, nor have I had one. It is not as though they had a Pro version either. They solicit a donation, and I made one years ago after first getting the program, for what that is worth.
I even opened IE, although I hate it and never use it, went to a few sites, and shot that down, tried CM again, and got the same message about Firebox. Something goofy going on, but I’m stumped.
Maybe poor old Cookie Monster is so full of cookies it can no loger eat any more. 
There is some discussion of the problem here. A couple of people say they solved the problem by updating the sqlite3.dll file. WARNING: I have not tried this and cannot personally vouch for it. Read the thread for details.
Obligatory zombie reference (OZR): Do zombies eat cookies?
Not trying to thread-poop, but the description of what Cookie Monster does is, well…just what happens in Firefox alone. You can look at all the cookies and delete any of them you want, prevent or allow from any site you want.