hello ratcliffe-c, A third-party plugin may be causing problems for Firefox when working with Facebook. Open up the Add-ons Manager from the main . * Click Click the 3 horizontal lines top right on browser screen button., click Addons-icon and select Extensions. * Scroll through the list of extensions. * Click the blue toggle for the extension you wish to disable. '''Clear all cookies, site data and cache''' * Click the 3 horizontal lines top right on browser screen button. and select Options. * Select the Privacy & Security panel and go to the Cookies and Site Data section. * Click the Clear Data… button. The Clear Data dialog will appear. ... * Click Clear. Restart the browser each time to see if the change fixes the problem. thank you!