This extension; https://addons.opera.com/extensions/details/minecraft-game/?display=en , is just junk. The description and the pictures does not show what the extension do at all. It's a speed-dial extension, and it only links to a website that creates a pop up that reminds me to update my java. How do I report this?
We saw the report you made on the extension itself. I note that it was criticized for being a speed dial extension in the moderation process, but then added some Java-based functionality. So upgrading Java might actually be the thing to do here.