In previous versions, setting browser.newtab.url to about:blank disabled the newtab grid.
Now that I've updated to Firefox 18, Firefox doesn't remember the setting.
When I restart Firefox, it changes the browser.newtab.url that I had set to about:blank back to about:newtab.
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If you do not keep changes after a restart then see:
I found an option in Tab Utilities that took care of the problem.
Thanks for your response.