Google searches for exactly what you type in by inserting nfpr=1 into the url.
Normally Google will fix some of your spelling mistakes automatically and tell you "Showing results for...". Sometimes these are not spelling mistakes. This script forces Google to search for exactly what you type in. It does this by inserting "nfpr=1" into the search parameters. With this script, Google will revert back to its classic behavior and ask "Did you mean..." when it thinks you misspelled something. Example: http://www.google.com/search?q=pumping+pie
This should search for "pumping pie". Google will search for "pumpkin pie" without this script.