In post #2 of this thread there are 3 .jpg attachments. Only the text of the attachments are shown, and not the actual attachments (cannot be opened). About a week ago they were already open in the post itself, and clearly visible.
https://www.xpforums.com/threads/howto-firefox-mp4-for-xp-and-multi-profiles.933606/
https://www.xpforums.com/threads/howto-firefox-mp4-for-xp-and-multi-profiles.933606/