Safari's got a built-in way to jump back several steps in your Internet navigation. All you have to do is click and hold on the back button in the toolbar, and you'll get a history of the places you've been in that particular tab or window.
Choose any one of those, and you'll be taken back to that page, which is much better than just hammering on that back button for ten minutes or so until you get to where you want. Also note that while I've taken the screenshots for this article in Safari, the same feature works in both Firefox and Chrome.
Another neat thing is that iOS devices can do this, too. Similarly, touching and holding on the back button in Safari will get you a list of all the places you've been in that tab or window, and you can tap one from the list to jump back to it.
This is helpful if you happen to run across a site that won't let you use your back button, either because its designers are incompetent or because they're pure evil. Just click and hold to pop back to where you were before you encountered the offending site, and away you go.