Chrome Extension Message passing: response not sent

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From the documentation for chrome.runtime.onMessage.addListener:

This function becomes invalid when the event listener returns, unless you return true from the event listener to indicate you wish to send a response asynchronously (this will keep the message channel open to the other end until sendResponse is called).

So you just need to add return true; after the call to getUrls to indicate that you’ll call the response function asynchronously.

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