Hi

What happens when you try to open Facebook? Is there an error message?

Firefox 78.15.0 is the last version for your Mac OS X platform (update channel: mozilla-mac-eol-esr1) and you will no longer receive updates, so you are out of luck if you can't update your OS. Current releases require Mac OS X 10.12 or newer.

• https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr

Firefox 78.15.0 on the Mozilla CDN server:

• https://download-installer.cdn.mozilla.net/pub/firefox/releases/78.15.0esr/

Absolutely nothing

Hi, please try to remove ALL references to Facebook. To do this follow these steps: 1. Open the 3-bar menu, choose History (looks like a clock). 2. Then click the Show All History link at the bottom of the list to open the Library window. 3. Type Facebook in the Search history field in the upper right corner, then press Enter. 4. Now in the search results, right click on Facebook and select Forget This Site. (Browsing and download history, cookies, cache, active logins, passwords, saved form data, cookie exceptions, images, and pop-ups for that site will be deleted.) Wait a minute for the removal to complete, and then try the site again (not from a previous bookmark). More information in the next link Delete browsing, search and download history on Firefox