The Opera web browser is currently available in two different versions, and multiple editions. The legacy Opera 12.x browser is still maintained by the company, but the majority of resources seem to be reserved for the new Chromium-based Opera 15+ browser instead.
It is likely that Opera Software will maintain both browser versions for the foreseeable future, likely until it believes that the new Opera 15+ browser is ready for prime time.
Not all Opera users see the move as something negative, and there are reasons for that. A faster rendering engine and better standards compatibility for instance, or the fact that most Chrome extensions work in Opera just as well.
What has not really been talked about a lot is how Google Chrome users can benefit from Opera’s move to Chromium. I’m not talking about code commits here or other development benefits that the Opera engineering team adds to Chromium’s code, but practical use for Chrome users.
Google Chrome users can install Opera extensions in their browser, just like Opera users can install Chrome extensions in their. While they may not work all, some do as they are using a compatible format. What is even better for Chrome users is that the Opera Extensions store does not have the same restrictions that Google imposes on the Chrome store.
So, if you cannot find an extension in the Chrome Web Store because Google does not allow extensions of its kind to be listed there, you may find it in Opera’s extension store instead.