yahoo is hyjacking my firefox web searches

Firefox is a web browser and not a search engine site. The desktop Firefox web browser has not come with a Yahoo search engine as one of the default options since the Firefox 57.0 Release. https://support.mozilla.org/en-US/kb/change-your-default-search-settings-firefox https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox

See some previous threads: * support.mozilla.org/questions/1590908 * support.mozilla.org/questions/1568176