Does it specifically reference a Primary Password?

Do you sign your Firefox in to a Firefox Account for Sync purposes?

I do not use a firefox account for any sync purposes at all. This is a 100% fresh install. Exact error message is attached.

Thank you!

Looks like a password for some security device. Do you have any USB security devices attached ?

That might indicate that Firefox imported a certificate or information about a one-time key from another browser. You could check here:

Open the Settings/Preferences page using either:

• Windows: "3-bar" menu button (or Tools menu) > Settings (previously "Options")
• Linux: "3-bar" menu button (or Edit menu) > Preferences
• type or paste about:preferences into the address bar and press Enter to load it

In the very tiny search box at the top of the page, type cert and Firefox should filter to the "Certificates" section. Click "View Certificates" and then "Your Certificates".

If anything is listed here, does it match up with the description in the popup?

This is a brand new fresh install of the OS (Fedora) which came with firefox installed - all super fresh.

no security devices connected (my yubikey has not been connected yet) no certs, only cert authorities

So I Googled this. I have no personal familiarity with Fedora or OpenSC, but apparently you can hide your Yubikey from Firefox -- it must already know about it somehow -- by running a script:

• https://gist.github.com/rbo/9121b2f4adbd928db8a87d2aa14c756d
• https://bugzilla.redhat.com/show_bug.cgi?id=1892137#c26
• https://discussion.fedoraproject.org/t/fix-please-enter-the-password-for-the-pkcs-11-token-piv-ii-rpm/37818