email on other device for saved password

My password work to log into Firefox. But when I logged in it reject the same password on my other device. it work fine logging into my cell .. but that same saved password won't work when it ask for a password on my tablet. Even after I clear setting in the app. I even uninstalled it and reinstalled yet it does not accept the same password I used to log into the account when it ask for the password to see my saved password. It work fine on my other tablet. My Samsung A7 lite tablet the password for work to send my saved password. But I use that same password to log into the account. Yet it does not like that same password when I try to see my saved password. Make no sens.