Firefox. The browser, reloaded (with a new theme).

While (re) installing Firefox on my father's laptop, I got around wiki-fying "Firefox". Many interesting and important things (of which I was not aware of earlier) were unveiled before me. Interestingly, I found that Mozilla Firefox got its 100 millionth download just after 344 days of its release. Firefox, in its earlier stages of development, was named as "Phoenix", then "Firebird", and then finally Mozilla Firefox. Mozilla was forced to change the name everytime due to trademark issues. Anyhow, I got around knowing about this most popular Firefox theme, which has around 11,000 downloads, and goes by the name: Noia eXtreme theme (download here). I installed it, and it is really cool.

Nice User-interface