The Global Weather Tab is supposedly a helpful browser extension where you will have quick access to weather information and popular useful links. However, it has been found to be a browser hijacker that will attempt to commandeer your browser search and homepage to the-global-weather.com which is a fake search engine. Search results will direct you to malicious websites to get money from you or infect your computer further. It will spam your screen with unwanted advertisements and may collect your browsing history as well as prevent you from changing your settings back.
The Global Weather Tab is usually installed through bundled software without you knowing. Remove it immediately.