Well at least I think it did. Facebook has an issue with scrolling through the feed in my group. I don't know whether there's also a problem on the home feed and also one's timeline. The further one goes back, the more sluggish it becomes and it takes longer to display posts. I'm not sure whether this is a browser issue as I haven't tested on other browsers, or a problem with Facebook pulling stuff out of the drawers in its archives. Maybe it's a memory issue due to all posts needing to be loaded in memory so it's possible to go back up through the feed to the newest one. Anyway, it gets to the stage after going back through hundreds of posts over 6 months, FB stalls. So I tried clearing my history (I have this set to not clear cookies). I then closed FB and Firefox. When I started Firefox again, I had to agree to cookies and sign into all my social media accounts, Google accounts and also agree to cookies on sites I visit regularly. So obviously a glitch in the browser, causing many, if not all cookies to be deleted.