Changing the search engines if required is fairly easy now as they are all the same as whatever is selected in the search bar. * [[How to use popular search suggestions in the Search Bar]] You may need to remove whatever software you installed to prevent some of these things resetting.Do the uninstalling from the Windows control panel * see [[Remove a toolbar that has taken over your Firefox search or home page]] Once the software is removed reset the things that were changed. The '''search reset '''addon is mentioned in the above linked article. It will do this for you automatically. The addon installs makes the changes and then uninstalls itself. * https://addons.mozilla.org/en-US/firefox/addon/searchreset/ Please post back to say how you get on

Did you check the Home page setting? *Firefox > Preferences > General > Startup: Home page *https://support.mozilla.org/kb/How+to+set+the+home+page