Changes

<b>Some features are easier and take shorter time to implement than others.</b> Ubuntu marks short easy bugs as bite size for beginners. The Firefox team couldn't show a window's parents in the window like Preferences -> Advanced -> General, because the feature was too hard or too long to implement.<br><b>Some features should be implemented before others.</b> If two features are equally important, you implement the easy one first and the hard one last. you'll be able to start implementing the unmentioned medium ones faster...<br>