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How do I stop Firefox from turning http:///icms/ into http:///www.icms.com/

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How do I stop Firefox from turning http://icms/ into http://www.icms.com/ ?

How do I stop Firefox from turning http://icms/ into http://www.icms.com/ ?

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Enter about:config into the location bar, click through any warning, then into the Filter box paste:

browser.fixup.alternate.enabled

Double-click the line listing that preference to change the value to false