Did you install the Yahoo Toolbar as an add-on? If so, see [[Remove a toolbar that has taken over your Firefox search or home page]]. Otherwise, you can use the [https://addons.mozilla.org/firefox/addon/searchreset/ Search Reset add-on] to easily restore your default Firefox search settings and home page.

Note that your System Details List shows multiple Flash plugins. # Shockwave Flash 11.8 r800 # Shockwave Flash 11.7 r700 You can check the Flash player installation folder for multiple Flash player plugins and remove older version(s) of the plugin (NPSWF32). *(32 bit Windows) C:\Windows\System32\Macromed\Flash\ *(64 bit Windows) C:\Windows\SysWOW64\Macromed\Flash\ You can find the installation path of all plugins on the <b>about:plugins</b> page.<br /> There is no need to toggle the plugin.expose_full_path pref to true in Firefox 22 and later, so leave this pref set to false. *http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins *http://kb.mozillazine.org/about:plugins *http://kb.mozillazine.org/about:config See "Manually uninstalling a plugin": *https://support.mozilla.org/kb/Troubleshooting+plugins ---- Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance). *Do NOT click the Reset button on the Safe Mode start window or otherwise make changes. *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes