I used to use FireFox but more recently have used Chrome. I still view e-mail accounts in Thunderbird. I downloaded 'new' FireFox.
A useful feature in FireFox for me was the saved passwords feature. When I try to use it now, my master password is not recognized. I don't remember changing it.
Have I lost it for ever by downloading 'new' FireFox? Is there a way of restoring it? Many thanks for your advice.