When you open a new window, is your homepage getting redirected to StreamLim search? If so, this is because a browser hijacker is causing it. StreamLim is a browser hijacker that will attempt to commandeer your browser search and its search results will send you to malicious websites to get money from you, spam you with unwanted ads, or infect your computer further. It may also prevent you from changing your settings back.
StreamLim is usually installed through bundled software without you knowing. Remove it immediately.