Starting with the alpha releases of Opera 11, you will be able to start using extensions in Opera. The extensions will be based on the W3C Widget specifications and are being considered for an Open Standard effort.
The extensions will be similar in some ways to their counterparts for other browsers and an effort has been made to try and make it easy to port extensions from certain browsers.
When it comes to installation you will click on the extension, have a small installation window appear, and then you will need to confirm the installation. You will also be able to drag and drop extensions stored locally on your computer into Opera for installation.
Once the alpha versions of Opera 11 become available you will be able to access the information for developing and publishing extensions on the developer site Dev Opera. The alpha versions will also be available soon on the Opera 11 Browser Next webpage.
Photo: Opera Red background photo by jorrddan.