Hi Paul,
We understand that you're currently unable to access Facebook using Safari or Firefox, and we're happy to take a closer look into the issue with you. To get started, can you tell us whether you're currently able to access the websites from other devices on your network, such as an iPhone or iPad while using Safari? This will help us better determine if there are any restrictions that could prevent access across devices.
If it seems to be isolated to the Mac, let's try the steps in the article below.
If Safari doesn't load a page or webpage items are missing
While most of our experience is with Safari, the steps for Firefox should be similar. Please let us know what you find.
We're here for you!