First off, let’s look at Safari, the built-in web browser on your Mac. So, in this post, we’ll look at Chrome, Firefox and Safari and go over what they can individually offer your web browsing experience on your Mac.selector, and of course the declaration blocks. That said, here are some notes that apply to all of the hacks in this article: For each hack, change only #selector. These Firefox hacks are organized according to version number and presented with ease of copying and pasting in mind.