how can i stop the display of "message source" in every email received (which takes up most of page)?
In windows 10 Firefox, most of page for each email received is taken up by "message source"details, making it difficult o read the text of the message. Can't find the setting or option to turn off this feature.
You posted in the Firefox support fora queue. Firefox doesn't do email, it's strictly a web browser.
If you are using Firefox to access your mail, you are using "web-mail" such as Yahoo!Mail or Gmail. You should seek support from your "web mail" service provider or a forum for that service.
If your problem is with Thunderbird, let us know and we can move this thread to the Thunderbird support queue.