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http://code.google.com/chrome/extensions/overview.html under UI Pages
The popup doesn’t need to duplicate code that’s in the background page because the popup can invoke functions on the background page.”
I have a function called functionBack() in the background page. This function is undefined if I call it from the pop up. What do they mean with that statement?
It means you can call it as:
and it will be executed inside background page context.