The HighlightAll extension for Firefox is a very useful tool for searching inside of one Web page for content. All you have to do to make this sucker work is highlight the word you want to find once. After that, the extension does all the heavy lifting and all occurrences of that word will automatically get highlighted.
No right-clicking. No menus. Just select the word with your mouse and you are on your way. This simple extension goes a long way for helping folks find a certain topic in large areas of text. With a white background and black text, my eyes sometimes might miss a word I am scanning for. Not anymore!