Lets get it straight, firefox,safari,opera.
Firefox, i think the best browser available in the market. It is really good for sarfing net. And it has a large extensions to support.
Opera has its widget power. But some how it is slow. (I dont know what others will say but i think it is really slow to load a page. and it also take more time to download, if i take a counter on firefox)
Safari, apples work, i should say any thing more about that? A nice browser, works well, have developer option build in, i think choice of a developer.
What about chrome? well babe, it need more maturity.