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Firefox for me is the best web browser because of its numerous addons.
I am a fan of firefox, because of the fascinating very useful FireFox Add-ons, see https://addons.mozilla.org/de/firefox/collection/e.m.4020.
Pros: With the very useful bookmarks management XMarks you can synchronize the bookmarks also with IE and Mac OS X Leopard and on mobile devices iPhone and iPad Touch, which is not possible with Google Chrome.
Cons: Download Sizes: Firefox 7969 kB, Google Chrome only 551 kB.