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This doesn't seem to work for me. I don't know if it's my computer of if Google has detected this plugin, disliked it and disabled it, but whenever I search for anything, for example the word "test" I get a page with a URL string like this:
www.google.com/custom?q=test

which is a Google Sorry page which reads:
We're sorry...
... but your computer or network may be sending automated queries. To protect our users, we can't process your request right now.
See Google Help for more information.

so it's pretty useless, for me at least.