hello juner, please look out for any suspicious 3rd-party-toolbars or things you have not installed intentionally in the programs section of the windows control panel and remove those entries. then go to firefox > help > troubleshooting information > profile folder - "show folder", then a new window will open up. in this window look out for a file named '''user.js''' (it is used to overwrite your custom settings). in case it is present , delete or rename this file and restart firefox afterwards. finally install the search reset addon - it will revert the most common customizations those adware programs do in firefox back to the default: https://addons.mozilla.org/firefox/addon/searchreset/ [[Remove a toolbar that has taken over your Firefox search or home page]] <br>[[How to fix preferences that won't save]]