when i search something in the search bar up by the address bar it is suppose to be using google thats how i got it setup but lately its been searching under yahoo why please help
You can choose search engines and set the order in which they are used in Settings > Search.
You can check for recently installed suspicious or unknown extensions.
Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.
- switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
- do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window