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 took 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><b>The Difficulty and Length columns in Feature tables</b> help beginners find features that are easy and take short easy time to implement, hackers compete for featuresthat are hard and take long to implement, programmers add implemented Firefox all sorts of features to their Curriculum Vitae's, hackers get peer recognition etc