Some sites use commenting systems embedded from other companies, and from time to time, these may be added to the Tracking Protection block list by Disconnect, the company that builds the list for Mozilla. As a test, try turning off Tracking Protection on the community page by clicking the shield icon at the left end of the address bar (next to the lock) and then clicking the slider switch at the top of the drop-down panel. Then Firefox should reload the page, or you can do it with Ctrl+R. Does that make any difference?