So you are a Google Wave addict using Thunderbird 3? There is a simple hack that can open Google Wave inside Thunderbird as a new tab.
Head over to the Error Console window(Tools > Error Console) and copy/paste the following code:
Components.classes['@mozilla.org/appshell/window-mediator;1'].getService(Components.interfaces.nsIWindowMediator).getMostRecentWindow("mail:3pane").document.getElementById("tabmail").openTab("contentTab", {contentPage: https://wave.google.com/wave/?nouacheck});
When done, hit Enter or press Evaluate button. Now you will see Google Wave open as a new tab. Simply login and starting Waving, all functionalities will remain intact and have been tested to be work.

Joshua Cranmer(the guy behind this code) further writes, “Note that Google Wave for some idiotic reason decides that Thunderbird isn’t a valid UA to be using, so you have to convince it to disable the UA with the ?nouacheck. I thought browser sniffing died out years ago…”.
Thunderbird 3 saves all tabs when closed, so you won’t have to go through the steps again when you start another session of Thunderbird. Enjoy!
Thanks Vordreller!
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