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Firefox is suddenly asking for master password twice after being idle

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Firefox 90.0.2 on Windows 10 was installed on 7/27/2021 which is about when this started.

Firefox is suddenly asking for master password twice, while running, not at startup. I leave Firefox running at night. I find two password dialogs when I log in in the morning. I'm not sure if they display at a certain time (e.g. midnight), or if it is a result of the system going into sleep and waking.

When Firefox starts or restarts, it displays one master password as expected.

I found this article from two years ago , but the "hotfix-update-xpi-signing-intermediate-bug" is not found in about:debug or in profiles.

I have not installed any add-ons recently. Last Windows update was KB5004237 installed on 7/18.

Is it Firefox? What else could be causing this problem?

Firefox 90.0.2 on Windows 10 was installed on 7/27/2021 which is about when this started. Firefox is suddenly asking for master password twice, while running, not at startup. I leave Firefox running at night. I find two password dialogs when I log in in the morning. I'm not sure if they display at a certain time (e.g. midnight), or if it is a result of the system going into sleep and waking. When Firefox starts or restarts, it displays one master password as expected. I found [https://support.mozilla.org/gl/questions/1262314 this article from two years ago] , but the "hotfix-update-xpi-signing-intermediate-bug" is not found in about:debug or in profiles. I have not installed any add-ons recently. Last Windows update was KB5004237 installed on 7/18. Is it Firefox? What else could be causing this problem?

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It may be our bug (https://bugzil.la/1721084).