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Why does the third party cookie setting (when unchecked) revert to "accept" when closing and reopening Firefox.

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Uncheck "Accept Third Party Cookies"

Exit Firefox

Open Firefox

Check settings: "Accept Third Party Cookies" is now checked

Uncheck "Accept Third Party Cookies" Exit Firefox Open Firefox Check settings: "Accept Third Party Cookies" is now checked

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See:


Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).