UPDATE I am giving this three stars because I have great hope it but believe it is too expensive for the FireFox spirit. I did have a problem when a logon page appears where I already have an account and FireFox Relay would not let me enter my actual email address to log in. I tried settings in FireFox add-on list and looked online for a support page with a solution; then I had to download an authenticator app on my phone to even make this comment which sparked a developer response that solved my problem! The solution, though, removes the helpful icon from every page where I might want to use it to create the temporary screen email. While I was looking at the solution (which was at a location not intuitive to me), I found another default setting to change.