How to Enable default online facebook chat at Shiretoko (Firefox 3.5) browser in Ubuntu 9.04 HD

1. Download and install the User Agent Switcher if you havent already. 2. After Shiretoko restarts, go to Tools : Add-Ons. Select Preferences for the User Agent Switcher. 3. Click the New button to create a new User Agent string. 4. Put Fake Official Firefox 3.5, or something else that makes sense to you in the Description field. The other fields are automagically populated with the default user agent, which makes our life easier. 5. At the very end of the User Agent field, replace Shiretoko with Firefox and click OK. 6. Move the new user agent (Fake Official Firefox 3.5) to the top. 7. Close the Prefferences window 8. Go to Tools, Default User Agent and then select Fake Official Firefox 3.5. 9. Go to Facebook. 10. Because the agent can not set by default, you have to activate it first, then you enter/refresh the facebook page. Enjoy! Refference : http://rrenomeron.wordpress.com/2009/07/07/ubuntus-firefox-3-5-and-facebook-chat/