29.3.2012 10:58
The console shows Unhandled DOMException: INVALID_STATE_ERR on running:
I tried a little debug with my own extensions using similar postMessage, the trick is to use opera.extension.broadcastMessage instead of event.source.postMessage . Replace it in the extension's background.js and it should work again.
Code:
opera.extension.onconnect = function(event){
event.source.postMessage(...);
};