Click the drop down arrow list beside the Google/Bing icon on the search bar. Then click Manage Search Engines. Select Bing then click Remove. Bing shouldn't be coming up anymore.

Hello I did remove Bing from the drop down menu, but it is still in Firefox as main search engine. I also did a back up and restore. Nothing has worked so far. I read a post that people were able to delete Bing from Explorer. I guess using Explorer will be my last resort.

Yup. Probably uninstalling Bing from Windows would make it totally go away. Goodluck.