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Microsoft stole my Chrome tabs, and it wants yours, too
(www.theverge.com)
This is a most excellent place for technology news and articles.
There is no modification, it's just a handy shortcut, read about bangs here. You are not expected to use !g for all searches, only for those that you wish to search with Google. It's also possible to replicate this with browser search settings, DDG just has this built-in.
Oh that does sound very handy actually, sometimes their results can be useful