The first post on the Facebook page will always display the timestamp, none of the remaining posts display the timestamp. 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). It is the same on different Facebook pages and using different Facebook accounts. I have checked my settings. I have cleared my caches, history, etc. I have restarted my computer many times. I have operated Firefox in troubleshooting mode, with extensions and add-ons disabled. I have done an anti-virus sweep with Kaspersky. This issue does not occur when I open Facebook in Microsoft Edge browser. I think this may have started approximately May 18 2023.