Chrome Extension Message passing: response not sent

Question

I am trying to pass messages between content script and the extension

Here is what I have in content-script

chrome.runtime.sendMessage({type: \"getUr         


        

Answer 1

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.