Fastest way to get some sort of integration between Toodledo and Thunderbird to handle your tasks and emails within the same app:
1- Bring up the Thunderbird error console
2- Copy the code below and paste it in the “Code” textbox of the error console:
Components.classes['@mozilla.org/appshell/window-mediator;1'].getService(Components.interfaces.nsIWindowMediator).getMostRecentWindow("mail:3pane").document.getElementById("tabmail").openTab("contentTab", {contentPage: "http://www.toodledo.com/views/folder.php"});
Press “Evaluate”
Done — a new tab with your Toodledo task list will appear next to the “Inbox” tab.