(very low priority idea, implement literally anything else first) Allow users to prevent being prompted to save certain password strings (or possibly regexes) in the password manager

[CauseOfBSOD]

This is mainly a feature request for those who have the misfortune to bank online with santander/cahoot in the uk.  Both of these banks will occasionally attempt to overwrite a password stored in the password manager with "disable-pwd-mgr-2" or similar.  Thankfully, the password manager is intelligent enough to not blindly replace the password with this junk but the repeated appearance of the prompt is rather vexatious.  By allowing users to specify a list of "passwords" that Firefox should never prompt to save, this would be defeated.

I understand that this is a hyper-specific use case and thus this would be very low priority (and may never be implemented, given that someone would have to maintain it after its implemented) but it would be greatly appreciated!

Although I could choose to never save passwords on a per-site basis, this would be irritating if I was ever to change the password.

[Jon]

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