mcr34 said

The Norton Vault has been unavailable since Fall of 2015. I've seen this question asked before and each time the response is that Mozilla is working on it. Can you tell me when this will be available, please? I understand I can open the vault in a different browser and cut and paste, but I'm referring to the autofill feature that I've used for years. Thanks.

It is Symantac that is working on it with their Norton product support of Firefox Releases.

Mozilla does not make or maintain any of these Norton extensions for Firefox nor is Firefox ever made to work with any extensions.

Symantac knew for months they needed to make an update and Symantac even asked Mozilla to hold off a change (for a extra Release) that affected the old way Norton was using to do their Firefox toolbar extensions. They have yet to finish past the partial support.

I have this problem, and consequently, I have stopped using Firefox as my browser.

That's your choice! Nothing that Mozilla can or will do to fix Symantec software or their Firefox extensions.