Questions from a junior programmer

[syho0426 at gmail.com]

I am a junior programmer, and want to improve my programming skills. I am thinking to spend time on Mozilla OSS projects. But there are quite a lot - Bugzilla, Seahorse, Thunderbird, Firefox. 

I am a beginner. Which project is the easiest for me? for instance, which project has the easiest-to-learn structure, very tiny code modularization? which project has the fewest lines of code?

Thank you very much. 
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