Mozilla Firefox has a couple of important advantages over Safari. The first is that Firefox is used about 5x as much as Safari, which has approximately 5% of the market share (compared with Firefox’s 25%). Firefox uses a layout engine called Gecko, which traces its origins back to the days of Netscape. By contrast, Safari uses WebKit which, until the recent release of Google Chrome, has never been viewed as being a major contender in the browsing market. Naturally, this means that developers will focus more time on ensuring that their sites are compatible with Firefox. In fact, most site developers typically will only focus on compatibility with IE, Firefox, and maybe Opera. Few will care too much about problems with lesser used browsers like Safari.
The second reason to choose Firefox is its renowned extensibility. There are many plugins to download that can customize your browsing experience. Arguably one of the most known is a little plugin called Greasemonkey. If you’d like to know more about Greasemonkey or to get the link to download it, please read this article here on Bright Hub.