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Cookies keep reappearing after deletion

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I have had Firefox set to delete cookies upon closure for several years now. I recently noticed that some cookies were present as soon as the browser was opened, which should not be happening.

This set of cookies reappears every time I open Firefox, even if I manually delete all the cookies, and even if I delete the cookies.sqlite file in between closing Firefox and reopening it.

This problem occurs on two machines with Firefox. One with Windows 7 and one with Windows 10. I have Sync configured to keep bookmarks the same on both machines. I was wondering if this may have something to do with it, as the same set of 'zombie cookies' keeps reappearing on both machines?

Alle svar (3)

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Do you possibly restore tabs with these websites as that might include cookies (cookies for tabs are stored in sessionstore.jsonlz4 as part of session data) ?

Other possible causes might be tiles on the Firefox Home page if you use this page.


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Thanks for the response.

Both the homepage and new tabs are set to show just the default Firefox Home.


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@ cor-el: I don't appear to have a sessionstore.jsonlz4 on my computer - it doesn't show up in searches.

If tiles on the Firefox Home page are causing this, how do I stop it?

Many thanks again.


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