Malware, adware, and pushy software installers love changing your browser settings, they will give you a new home page, a new default search engine, and obnoxious toolbars. This happens because of un-checking a check-box while installing any third party software. Usually these companies have collaborations with newly evolved search engines, websites etc. And for promotion of their products they provide these small utilities with softwares which install in background without getting noticed by user. And after installation, they change everything in your web browser. Whenever you search in address bar you are redirected to an unknown search engine OR you start seeing ads on all webpages, even on non commercial websites which don’t show ads. All these things are done by those small unwanted softwares.
Reverting these browser settings isn’t too difficult. But you may have to do it manually, even if you uninstall those unwanted softwares, you will still have to restore your preferred home page and default search engine.
Now let’s do it step by step:
If a program has changed your default search engine, then whenever you will search in address bar of your browser, it will open a new and unknown search engine.
You can change your search engine back easily:
Click the Gear button, select Manage add-ons, and then go to Search Providers category. Choose your preferred search provider from the list and click the Set as default button at the bottom of the window. You may also want to enable the “Prevent programs from suggesting changes to my default search provider” check box. It would be better if you delete unknown search providers.
First, click the search engine icon in the search box at the top-right corner of the Firefox window then select your preferred search engine from the list. Also delete unwanted search providers.
Right-click inside the location bar at the top of the Chrome browser window and select Edit search engines. Select your preferred search engine and select Make default.