Couldn't register a second e-mail address in Monitor.
Primary address registered okay. The 2nd address I atemtped failed, as when I opened the verification e-mail, then pressed the 'verify' button, a message appeared saying, 'error', not signed in to Firefox.' I selected the sign in button, and a form for creating an account appeared, with no option to sign in to an existing account. Using Windows 10.
Additional System Details
- User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0