New GreaseMonkey User Script
Gordon McNaughton, Craig Olrich and I created a new user script called GoogleSearchRefiner and added it to the repository.
“Add or Exclude selected text in future searches on a google search page using ALT-PLUS and ALT-MINUS.”
Update: Changed from CTRL to ALT because Linux Firefox thinks the user is trying to change the font size. Thanks for the tip, David Wiesen!