If you are using the Windows Firefox, it's probably a good idea to check Microsoft's site for more information. If you are using a security suite with a firewall, you could check their support. If the problem is a Firefox setting, perhaps it is Enhanced Tracking Protection? The shield icon toward the left end of the address bar usually turns a bit purplish when content is blocked. Click the icon to learn more or make an exception. See: [[Enhanced Tracking Protection in Firefox for desktop]]. Otherwise, you might check content blocking extensions. For example, Adblock Plus, Blur, Disconnect, DuckDuckGo Privacy Essentials, Ghostery, NoScript, Privacy Badger, uBlock Origin or uMatrix usually provide a toolbar button to manage blocked content in a page. There may or may not be a number on the icon indicating the number of blocked items; you sometimes need to click the button to see what's going on and test whether you need to make an exception for this site.