Suddenly—with no changes made in Firefox, no power failures, no anomalous occurrences, and with the latest version of Facebook—Facebook would not display reels when clicked on. What came up was at first a briefly (maybe a second) displayed image, but rather than remaining, the image disappeared, leaving an all-black screen except for the usual icons normally there: in the upper left, the "X" for closing the window and the Facebook logo; in the upper right, the Facebook menu, messenger, notifications, and account icons; at the middle right, the up and down circled arrows (which function but which lead to more displays of only black as well); and lower-right center, with the vertical display of the thumbs-up emoji, comment, share, the three-dots more options icons. Firefox 149.0.2 is installed on a Windows 11 computer less than a year old (which has displayed no anomalous or unusual behavior at all). Clearing the Firefox cache and restarting Firefox have done no good. What is wrong here? Thank you.