Found an extremely nifty extension for Firefox this evening, Auto Context. It watches for when you select some text and then pops up a menu offering you choices, like so:
This is very handy for when you want to just copy text off a page without getting all the HTML so that your word processor doesn't overwrite your existing styles, and the "Search with..." option at the bottom of the list gives you all the search engines you have in the search field. The options you can see are the ones I wanted to keep but there is a very comprehensive options window to put exactly what you want up.
PS. Using this extension I can remove Context Search and Right Click Link.
PPS. I ought to give you the AMO link: https://addons.mozilla.org/en-US/firefox/addon/5714