Where does this happen? On one website, several, many? That looks like a message window, but the content is blocked.

As I said, it's generally on facebook.

It does look like a message window, but there is never a message.

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. * [https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored Delete cookies to remove the information websites have stored on your computer] {web link} * [https://support.mozilla.org/en-US/kb/how-clear-firefox-cache How to clear the Firefox cache] {web link} If there is still a problem, '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode 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. ''[https://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration How to disable Hardware Acceleration]'' {web link}

Note that current ESR is 60.5.2 *https://www.mozilla.org/en-US/firefox/organizations/all/ *https://www.mozilla.org/en-US/firefox/60.5.2/releasenotes/

My husband suggested I open facebook in a private window to see if I got the blank window there. I did not. So then I deleted all the cookies/cache. I have not seen the blank window since. Thank you for your help.