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Authoritative.
Strategic.

Extensions can control tabs and windows
Extensions in Opera 12 are now permitted to interact with browser windows and tabs (or groups of tabs). For example, an extension can be written to open or close a browser window or tab. Obviously, this raises the spectre of malicious or untrusted sites cluttering up your browser with windows and tabs you don’t want opening, but is necessary to allow legitimate sites to have, such as web apps.