Firefox 3 disable extentions compatibility checks

• Type about:config into Firefox's address bar and click the "I'll be careful, I promise!" button.
• Right-click anywhere. Choose New>Boolean. Make the name of your new config value 'extensions.checkCompatibility' and set it to 'false'.
• Make another new boolean pair called 'extensions.checkUpdateSecurity' and set the value to 'false'.
• Restart Firefox.