At the top of the Firefox window, click on the Firefox button (Tools menu in Windows XP) and then click Options.

Click the Advanced panel.

Click the Update tab. The update optionspreferences are displayed.

Firefox updates:

• Automatically install updates (recommended: improved security):Firefox automatically downloads and installs found updates.
  • Warn me if this will disable any of my add-ons: If you wish to be prompted if the downloads will disable any installed add-ons, select that setting.
• Check for updates, but let me choose whether to install them: Firefox lets you choose if you want to download and install updates. If you do not choose to do so, you can download them at a later time.
• Never check for updates (not recommended: security risk):Firefox will not check for updates. Warning: If you select this setting, you will not receive critical security updates that may keep you safe online unless you frequently do a manual check for updates.
• To review the history of updates that have been downloaded and installed, click Show Update History.

Automatically update:

• Search Engines: Check this to receive automatic updates to your search engines.

Click OK to close the Options window

Click Close to close the Preferences window

Close the Preferences window