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}

I already tried safe mode. Disabling hardware acceleration and clearing cookies and cache did not work either. I also turned off Enhanced Tracking Protection - still a no-go.

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

I ignored the 'computer safe mode' advise because it is started happening not just on my personal computer, but on 4 others in my home. And low-and-behold - it is suddenly working this morning. Guess? ==> Firefox did not update, so it has to be the way Yahoo Weather interacts with the browser. It appears that Chrome, Edge and Opera were not affected, so they must handle things differently. ==> This would lead me to believe that Yahoo changed something.

In and case, it now works.

Good to heara. Safe surfing.