Then you need to set a homepage or homepage search engine for Firefox. https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox

''<p>Mark Swan [[#question-1475513|said]]</p>'' <blockquote>Yahoo now comes up on my Firefox browser With reference to my question just posted, also now when I click on my Firefox browser, the Yahoo search engine seems to take over and it won't let me come out of it. Mark </blockquote> Firefox is a web browser and not a search engine as Yahoo is a search engine. Mozilla does not have a search engine of their own. Firefox has not come with Yahoo as one of the search engine defaults (nor anything else Yahoo related) either by Firefox install or a Firefox update since the Firefox 57.0 Release as you can see in [/forums/contributors/712925] It could have been installed/changed by one of your Extensions you have installed in Firefox either during recent extension install or extension update. So either it added a Yahoo search engine or took over your Homepage. https://support.mozilla.org/en-US/kb/how-to-set-the-home-page https://support.mozilla.org/en-US/kb/extension-changed-my-new-tab-page https://support.mozilla.org/en-US/kb/wrong-home-page-opens-when-i-start-firefox-how-fix https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox https://support.mozilla.org/en-US/kb/change-your-default-search-settings-firefox