If you are not aware, Opera (the browser) has recently switched from its own Presto engine to Webkit, the engine used by Chrome and Safari. With this change, you can now install Chrome extensions in Opera. This will give you an instant boost of the number of extensions available for Opera. Here is how you can install Chrome extensions in Opera.
1. Make sure you have installed Opera version 15 and above. This is currently available only for Mac and Windows.
2. Launch Opera and head over to this URL and install the “Download Chrome extension” extension for Opera.
3. Once you have installed the extension, you can now head over to Chrome web store and install your favorite extensions.