https://support.mozilla.org/en-US/kb/push-notifications-firefox https://support.mozilla.org/en-US/kb/push-notifications-firefox#w_how-do-i-revoke-web-push-permissions-for-a-specific-site

Small popups on the lower right corner of Firefox windows may be web push notifications from sites you have allowed to send you notifications. Instead of useful information some may send you junk, spam, fake virus/trojan alerts etc. You can revoke these sites from sending you notifications as second kb link above shows.

Thank you for the info. However, the pop ups are from Mozilla; so your info did not solve my problem. Ron [Email address]

Hi Ronald

I will remove your emails address from your answer for your privacy and security as this is an open forum.

Are you able to share a screenshot of one of these messages in a reply to this thread?

Thank you for the info. However, the pop ups are from Mozilla; so your info did not solve my problem.

You description of small popups on bottom right corner of Firefox windows is where web push notifications occur. These are not popups from Mozilla nor the Firefox web browser but from sites you have allowed to send you notifications. The mention of Mozilla Firefox on top of these small popups does not mean it came from the Firefox web browser or Mozilla as that would be a first if they did.

If what you are seeing looks like the screenshot example in https://support.mozilla.org/en-US/questions/1557645 then these are web push notifications. You can revoke those notifications as per mentioned KB article in my earlier reply.