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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 Antworten (5)

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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.

Hilfreich?

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Thanks for the response.

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

Hilfreich?

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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.

Hilfreich?

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sessionstore.jsonlz4 is only present in the profile folder when when Firefox is closed.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

Hilfreich?

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The cookies are still reappearing when I start Firefox and sometimes after opening a new tab, even if new tabs and the home page are set to show a blank page and nothing else. I have no idea what is causing this, any further suggestions?

Hilfreich?

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