Have you ever followed a link from Google only to find that the page it leads you to is full of text that you must read through in order to find the terms you searched for?
In Firefox and most other browsers, you can press the F key on your keyboard while holding the CTRL key down and you will open a find tool.
This tool works like a miniature search engine for the page you are on. Simply type the term you are searching for on the page into the little Find box that comes up and each instance of that word or term will be highlighted. You can hit the NEXT or PREVIOUS button to go to each instance.