Cookie not removing cookies
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Do you have this https://addons.mozilla.org/en-US/firefox/addon/imdb-movie-search/ or some other IMDb extension installed?
If so, the cookies which are not removed are likely browser extensions. These are whitelisted in Cookie by default. You can change this setting in the Advanced tab in Cookie Settings.
Just Uncheck the option “Never remove Browser extensions’
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Using the extension, I can delete all items of the "imdb.com" Firefox cookie, except one (see screen capture).
This item does not appear in the cookies.sqlite file in the Firefox profile, if I open it with an SQLite editor. But it does appear in the cookies.sqlite file if I open it with a text editor.