Becoming invisible in Pidgin on Gmail

1. Open the Buddy List.
2. In the menu, Tools->Plugins. Enable XMMP Console. Close the Plugin Window
3. In the menu again, Tools->XMMP Console->XMMP Console.
(See if your account in which you want to go invisible is selected if you have multiple accounts. )
4. In the text box, put the following XML snippet

{{{
<presence>
<priority>5</priority>
</presence>
<presence type="unavailable">
<priority>5</priority>
</presence>
}}}

and then press enter.
5. Done this is it. If this is not working on your version, now try changing the status to Invisible.

Finally, if you want to reset the above settings. Follow the same procedure but make < presence type="available" > in the above XML snippet.