If you mean the Send Image, Send Link, and Send Page items in the context menu, those were removed. I imagine that the function would be removed as well.

Actually, no. I mean the File->Email Link... item and the RightClick->Email Image ... (when over an image) item. They're both still there, and do work on my other logins, on several other up-to-date machines.

See:

• https://support.mozilla.org/kb/Changing+the+e-mail+program+used+by+Firefox

Thank you. Although I had already checked the MailTo: application and found it set to "Use Thunderbird (default)", clearing that association and setting it to "Always Ask" jarred things loose. When I set it back to T-Bird, it worked again.

Again, thanks for the nudge.