What this extension does - as its name implies - is allow any version of Opera based on the Blink rendering engine (that means Opera 15.0 or later) to make use of Chrome extensions.
As things that do what they say on the tin go, its title pretty much covers its capabilities. Once installed – no restart required – you’ll be able to browse the Extensions portion of the Chrome web store and install those extensions in Opera using the Add to Opera button that appears. And because Opera uses the Blink rendering engine, things should go smoothly.
It’s worth noting that the extension – as it clearly states – does not work with Chrome web apps or themes. Neither will it work with older versions of Opera based on the browser’s original Presto web rendering engine.