I'm a huge fan of Firefox and Mozilla. I like the attention to privacy and it shows with the many built in features as well as the partnerships that have been made. My big gripe unfortunately is that every time I open Safari, and start navigating, the browser just feels so much lighter to use. Scrolling performance and browser animations are snappier. As a test case, simply open a mildly complex page like Facebook or a Google search in any of the major browsers. Scroll up and down and you'll notice a significant difference in terms of rendering speed. In windows, I notice the same as well in Chrome.