The first post on the Facebook page will always display the timestamp, none of the remaining posts display the timestamp - only a dot or period. The space for the timestamp is there and hovering the mouse over it will show the date and time (so the information is on the page, just not displaying). I've tried all the CSS fixes, installed the stylus extension, created a userContent.css - essentially everything that seemed to help people a year ago. None of it fixed the problem. I've disabled ALL add-ons - made no difference. I'm on Windows 7 pro x64, Firefox 115.12.0esr (64-bit). Chrome doesn't have this problem. As far as I'm aware it started within the last day or two.