Google announced late last week it would begin halting the silent installation of extensions on its flagship Chrome browser. Chrome s Product Manager Peter Ludwig described the problem that led to the change and two new features present on the latest iteration of the browser, Chrome 25, released last week. Before the change, users could have had extensions installed on their browser silently, without their permission via the Windows registry mechanism. This was a way for third party companies to get users to unknowingly opt-in to these extensions.
Source: https://threatpost.com/google-begins-blocking-silent-extension-installations-chrome-25-122612/77343/