Frozen display

After years of trouble-free use my add-on bar display has frozen and will not update. I can change the display like xc to xf or add number of days displayed. when I pull up the full screen every things up to date except the toolbar display. I have re-booted a number of times and cleaned the Firefox Cache.
Any other suggestions

The Firefox extension was discontinued a few months ago. WeatherBug recently shut down the data feed used by that extension – which is why you’re probably noticing this right now.

If interested, you can try the desktop version of Weather Watcher at