1. Started with an on-line search: “how to reply with same email to multiple identities in thunderbird” 2. Which produced: https://addons.thunderbird.net/en-US/thunderbird/search/?q=Helge&appver=&platform=: “Thunderbird Add-ons - RepSel: Reply to all selected mails” by Helge” 3. Where I clicked the “Download Now” link button 4. Which took me to: file:///D:/DEFAULT%20DOC%20FOLDER/DOWNLOADS/2022/repsel_reply_to_all_selected_mails-4-tb(6).xpi (w/popup: "This add-on could not be installed because it has not been verified" Learn more. OK) 5. Clicked on the "Learn More" link, which took me to: https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox?as=u&utm_source=inproduct: “Add-on signing in Firefox” 6. Where the only pertinent information I could find was the "HELP ME" link at the top of the page, which I clicked. 7. When I placed the cursor on the “Get Help” link, a drop-down appeared offering the “Ask A Question” link – which I clicked. 8. This took me to: https://support.mozilla.org/en-US/questions/new: “Contact Support - Which product do you need help with?” and offering the option of a link to Thunderbird, which I clicked. 9. Which took me to: https://support.mozilla.org/en-US/questions/new/thunderbird 10. There, I clicked the “Thunderbird Solutions — Still need help? Continue to post your question and get help. Ask Now” link. 11. Which took me to: https://support.mozilla.org/en-US/questions/new/thunderbird/form: “Ask your question” 12. All of this just to get to the point of requesting information and assistance . . . ! Not impressive or particularly useful. 13. So: Here we are . . . IT TOOK ONLY THESE 12 “EASY” STEPS ON YOUR WEB PROGRAM TO GET TO THE PLACE A PERSON CAN ACTUALLY ASK A QUESTION! I don’t appreciate having to waste several hours out of my day. 14. And, finally now, actually getting to the question: Even though information about how to install the “RepSel: Reply to all selected mails 4 by Helge” Add-On can be found on your website, there is no readily -located directions about how to resolve the "This add-on could not be installed because it has not been verified" business. Please do tell: What is the magic solution?