Please explain the problem in detail. What happens? What are the exact error message(s) ?

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}

If there is still a problem, Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Did this help?

While you are in safe mode;

Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.

How to disable Hardware Acceleration {web link}

edpeaco said

I recently replaced my hard drive in my iMac 27-inch, Late 2013, with macOS Mojave 10.14.5. Now my Facebook does not present on in Firefox. Only the blue bar across the top comes up. Clicking on the delta at the top right give access to "General," "Your Facebook Information," "Security and Login" and other items, but I can't do anything in these areas. However, Facebook works fine on Safari. I would prefer to keep using Facebook on Firefox.

Thanks for your help. It became rather easy after I read the responses. — Ed Peaco

Glad to help. Safe Surfing.