I have an extension for Chrome that was working fine on Opera 15 (and works fine on Chrome 29).
Stating with Chrome 16, I get this error:
Uncaught TypeError: Cannot call method 'getBackgroundPage' of undefined
Spefically, chrome.extension is undefined.
The code in question is:
function _getBackgroundPage() { return chrome.extension.getBackgroundPage(); }
Did something change or break in Opera 16?
The add-on is here:
https://chrome.google.com/webstore/detail/webde-mailcheck/jaogepninmlbinccpbiakcgiolijlllo?hl=en
And the error occurs when going to Options and clicking "Add..." to add a new account.
At the core, the problems seems to be loading a chrome URL into an iframe (on another chrome page). This is allowed in Opera 15 but it broke in Opera 16.
Yup, thats a bug in Opera. We're aware of it and are working to fix it.
Cheers,