I'm afraid the issue is more about Safari than Facebook. If it works fine with other browsers, but just not Safari, doesn't that imply there's something about Safari that's unable to do what other browsers are? It's been happening for many months, and more recently, with updates, it's become near-impossible to interact with it at all. It becomes unresponsive, runs up RAM & CPU usage, and slows down my whole computer! And I have a very fast internet connection, and 64 GBs of RAM, so it shouldn't be having these kinds of issues. If a fix isn't going to be happening, I'll have to use another browser, which is mind-boggling, as one would think, intuitively, that Apple's own browser would enable us on Apple computers to have better functionality not less!