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When I show the cookies of the current website and click to delete all cookies, all firefox cookies are deleted.

It's brings confusion.

Ta opinia jest o wcześniejszej wersji dodatku (1.9.1). 

Hi,
Using the main CookieKeeper window, I can't reproduce that.
If you have a domain in the search textbox, or any other search, when you click on "Remove All", only displayed cookies are deleted.

If you use the "Remove All Cookies" menu item from the toolbar, or the Firefox menu, yes, all cookies are deleted. It is the expected behaviour from my point of view.