Your plugins list shows that you have the Bing Bar plugin installed. Did you install any software or add-ons that may have changed your Firefox search settings to Bing, such as a third-party toolbar? See [[Uninstalling toolbars]]. Try disabling the Bing Bar in the Add-ons manager Plugins list, check for a toolbar or other add-on in the Extensions list that may be related to the Bing search engine and disable it. You can then reset your search preferences, if necessary. The [https://addons.mozilla.org/en-US/firefox/addon/searchreset/ SearchReset add-on] (which is linked from the [[Uninstalling toolbars]] article) should reset your Firefox search preferences to the default settings, which would be Google.