Comment 3 for bug 894056

I finished the extension today, you can check it out at https://addons.mozilla.org/de/firefox/addon/gtg-task-button/ (Careful, it is still very hot)

You can use it in Thunderbird as this bug suggests or also in Firefox, e.g for quick bookmarking of page to read it/do something later. I would be glad to hear your feedback and bug reports!