If you use the Firefox browser, you can hit the F3 key and bring up a search box. It will highlight the first occurance of your search word or term. It then has buttons to go to "Find Next" or "Find Previous" or "Highlight all."
If you select "Highlight all" it will make all results yellow. If you want to close that search result out after hitting the button that closes the window, I think you have to close the Firefox tab. If you close that little window in the bottom out and hit the F3 key again it just advances a green box to the next result.
The Firefox browser is a wonderful thing with its tabs and extensions. It is free and can be downloaded at http://www.spreadfirefox.com/