Trying to make my Chrome extension compatible with Opera.
For Chrome I can append the extension ID to "https://chrome.google.com/webstore/detail/" and I can get the Chrome Web Store url of that extension.
Does Opera have anything similar?
Yes, you can. Just use:
https://addons.opera.com/extensions/details/app_id/[extension_id]
For example, for AdBlock:
https://addons.opera.com/extensions/details/app_id/aobdicepooefnbaeokijohmhjlleamfj