Question 2,  How do I use Firefox Monitor to change my Firefox account primary email address to an email that is already in use, by me, used for an older version of Firefox on a previous computer that is no longer in service? 

Question 1. I see questions similar to mine, but how do I access replies? I click on them, but there is no link attached. Question 2, How do I use Firefox Monitor to change my Firefox account primary email address to an email that is already in use, by me, used for an older version of Firefox on a previous computer that is no longer in service? This is what I've done. In Monitor, I clicked on the link that says "Change Primary Email Address." It goes to a nice instruction page. I click Menu lines, go to Manage Account, I try to add the email as a secondary, so that I can then make it my primary. I click save. However, I get a pretty red error message that tells me "Account already exists." Of course it does. It's my account. I'm on a less than a year old PC, which came with Windows 11 already loaded. I'm on Firefox version 109.0.1, 64-bit. I've used Firefox on laptops for years. I'm very comfortable using regedit. Thanks. Lakshmi