When Thunderbird injects a link preview into a message, it changes the text composition from Body Text (my norm and default) to Paragraph. This styling change persists even after I delete what look like the entire preview. My fix for the current message is to select all and reestablish Body Text, then clean up left over mess. My overall fix is to uncheck Settings > Composition > Add link previews when pasting URLs Clearly HTML is required to create a graphic preview box in a message. I do not recall having turned link preview on to begin with, so I'm feeling opted in. Do Thunderbird updates download with this option turned off? ___ Another reason I eshew link previews is that they appear to establish connections to online assets without asking. How is this safe? As a software developer - and simply as a user - I have occasion to send people links that I don't want to connect with. To pick an easy edge case, what if I'm reporting a phishing or malware site? Just because I type or paste an URL into an email message doesn't mean I want to download anything from that source. Curmudgery aside, I'm grateful for your help as always. Paul