Firefox app

Problems with App, been trying to email since Sat., had to reset password sunday. Trying to email but it keeps saying email not valid. Tried & Mozilla support., both says not a God address. Unable to get firefox set as default browser, click icon nothing happens. Error codes say server problems, data connections keeps being taken down. Settings in Firefox changed 3 days in a row as well as Chrome was changed again. 3 times. While changing settings this a.m. in both apps they kept being changed in front of my eyes. Google play was hung up on ads, my VPN keeps being taken down. Don’t know if you will get this but thought I would let you know & see if there’s any help.