Rated 5 out of 5 stars
I encountered a bug (same as other users) and tried to file a bug report on trac as advised here. I registered, but I'm not allowed to post a bug.
So here is a bug report, you can delete this comment after it's resolved:
Today, The weather forecast (icons, data, location) for my preferred location (Lyon, France (Rhone-Alpes): EUR|FR|FR022|LYON|) disappeared suddenly, although this location is [http://www.accuweather.com/world-index-forecast.asp?partner=forecastfox&traveler=0&loccode=EUR|FR|FR022|LYON still available on accuweather]. If I try to find code in forecasfox, no result is returned for Lyon. But the other locations I configured a long time ago are still correct (In France, Belgium and US).
I did not install anything new on my Firefox at this time.
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:188.8.131.52) Gecko/2008120122 Firefox/3.0.5 and Forecast fox 0.9.8.
It seems that only certain locations are affected by this bug.