"Email link" option changes font to "Times New Roman" at end of the URL in Outlook

When using the "Email link" option in Firefox, it then calls Outlook, then inserts the title of the webpage, as well as the URL. This is a handy feature that I have been using for years, but has always had an annoying bug.

The URL in the body of the message conforms with Outlook's settings (font is Calibri 11 for me), but then Firefox also adds a space at the end of the URL, which is formatted in Times New Roman 12. I have gone through every template and setting Outlook and checked for TNR. It is nowhere to be found. This is something that Firefox is doing, and has been doing for many, many years (at least as far back as version 3.6, all the way to 17, which I'm running now.