CometBird is developed from the source codes of Mozilla FireFox and also follow the source code license of Mozilla.
FireFox is a fast, powerful and full-featured web browser which is an open source program. By using the FireFox codes (exactly the same except some logo pictures) and carefully selected addons, we make CometBird stable and easy to use.
Thus, any improvement and bugfix of the source code should go to the Develop Center of Mozilla Firefox.