Hello, I am using Firefox 80.0. Since the last update, some Comcast emails I send from Xfinity's web email portal have not been getting to their intended recipients. I get an email sent pop-up message. They show up in the sent folder. But they don't arrive where they are supposed to go. These are to clients I regularly correspond with so it's not a case of a typo in an email address. I get no notice that the emails did not arrive. I did several test emails to a Gmail account I use infrequently. They did not arrive. Then I decided to log in to my Comcast/Xfinity account on Google Chrome and send test emails from there and that worked. Anyone have any idea what's going on here? I really want to continue using Firefox for many reasons. Thank you. Regards, Slack