What is Forecastfox? Get international weather updates (via AccuWeather.com) displayed right in Firefox with this highly customizable extension. Forecastfox features:

• Vertical and horizontal displays
• Select multiple “favorite” locations
• Set your preferred units of measurement (Fahrenheit, Celcius, or custom)
• Dozens of weather icon styles to choose from
• Designate pages to hide the forecast bar
• Select the number of days you want a weather forecast
• Lots of fine detail settings like info on humidity, wind, precipitation, visibility & more

WebExtensions Limitations:

• Forecast bar will not be displayed on some sites from mozilla.org and google.com
• Forecast bar will not be displayed on sites that do not have pages, for example error 404 (page not found)
• Forecast bar will not be displayed on internal Firefox and GoogleChrome pages, for example about:addons , about:config , chrome://extensions/ , chrome://settings/ , etc.
• Forecast bar will not be displayed on the WebExtensions pages "moz-extension://...." , "chrome-extension://...."
• Forecast bar may not be displayed correctly on some sites. In this case, report the problem on the forum

Sorry for the inconvenience and thanks for understanding! ============ You also can use Forecastfox (fix version) for Google Chrome: https://chrome.google.com/webstore/detail/forecastfox-fix-version/boljdehmejbffnfiiicckjhafabdepnd ============ -- forums mozillaZine: http://forums.mozillazine.org/viewtopic.php?t=2913287 forums mozilla-russia: https://forum.mozilla-russia.org/viewtopic.php?id=6652