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