The new Chrome extension allows to activate the SSL version of Google Search.
Last May, Google has its search engine with a system SSL to protect the queries and results pages against attempts to intercept data.
This secure mode will soon be available directly in Chrome through extension that is officially named as Google SSL Web Search.
Currently in beta, the latter works with version 6 of the browser which is currently still in the developer channel.
Once installed, the extension can set (right click in the toolbar and then select "Edit search engines") the address bar Chrome to use the SSL version of Google Search as your default search engine.
It is also possible to access this mode directly using URL of the beta site.