This is the reason I switched to Bitwarden.
While I don’t have the solution OP is looking for, Bitwarden will provide the functionality OP is wanting.
Yes, you are correct. Bitwarden or any password manager worth it's salt will do the job. I used to be on Keepass [the fork KeepassXC is quite good now] some years before. That being said, I thought there might be some simple about:config toggle to resolve the condition. I also wish more sites supported 2FA so that passwords stopped being the only point of vulnerability.
KeePassXC too, btw.
Pretty much any password manager
I wish this to happen only when I am accessing the passwords or when a site is autofilling it
This used to be the default behavior several years ago, I'm not sure why it was changed
Probably it is necessary for the Syncing Function? Try to disconnect the Firefox-Account and see if the Dialog comes again.
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