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Cookies and Site Data Exceptions lost each Firefox update

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At each update of Firefox, which seem to come more frequently, the list of Exceptions Allowed for Cookies and Site Data is erased. I have to rebuild the list after each update. "Delete cookies and site data when Firefox is closed" is set to Yes. I use "Manage Exceptions" for the sites not to delete. These are set to "Allow", which I understand to be permanent. Preservation of this list works fine between Firefox updates. Other aspects of personalization seem to be fine: Bookmarks, History, Screen Preferences, Shortcuts, etc.

What am I missing?

Running Firefox 91.0.1 (64-bit) on a Win 10 Pro 20H2

Thank you.

At each update of Firefox, which seem to come more frequently, the list of Exceptions Allowed for Cookies and Site Data is erased. I have to rebuild the list after each update. "Delete cookies and site data when Firefox is closed" is set to Yes. I use "Manage Exceptions" for the sites not to delete. These are set to "Allow", which I understand to be permanent. Preservation of this list works fine between Firefox updates. Other aspects of personalization seem to be fine: Bookmarks, History, Screen Preferences, Shortcuts, etc. What am I missing? Running Firefox 91.0.1 (64-bit) on a Win 10 Pro 20H2 Thank you.

All Replies (2)

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Sounds that you lose the Site Preferences for some reason. I can't think of a reason for this to happen only when you update Firefox.

Clearing "Site Preferences" clears exceptions for cookies, images, pop-up windows, and software installation and exceptions for passwords and other website specific data

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cor-el: Yes, the behavior mimics clearing site data. But how do I prevent this from happening for the managed exceptions at each update?