Hi, The [https://www.mozilla.org/en-US/firefox/new/ original Mozilla Firefox installer] doesn't include the particular search engine. You can right-click the Mozilla Firefox installer > '''Properties''' > '''Digital Signatures''' and verify that it says '''Mozilla Corporation'''. If the search engine got installed via an external Windows program, you can try to reset Firefox and start afresh. The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.'' To Reset Firefox do the following: #Go to Firefox > Help > Troubleshooting Information. #Click the "Reset Firefox" button. #Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish. #Firefox will open with all factory defaults applied. Further information can be found in the [[Reset Firefox – easily fix most problems]] article. Did this fix your problems? Please report back to us! After resetting, please see [http://proxify.com/configure.shtml#Windows_Firefox this] for the correct proxy configuration. Alternatively please see [http://proxify.com/toolbar.shtml this]. [http://proxify.com/contact.shtml Support]