Demo for cross-extension messaging in chrome extensions

background-1.js

chrome.runtime.onMessageExternal.addListener(function(request, sender, sendResponse) {
    console.log('incomming');
    if (request.getTargetData){
        console.log('We have target data');
        sendResponse({targetData: {}});
    } else {
        if (request.activateLasers) {
            var success = true;
            console.log('lazers active');
            sendResponse({activateLasers: success});
        }
    }
  });

background-2.js

var id = "[ID FOR APP ONE]";

console.log('target data sent');

chrome.runtime.sendMessage(id, {getTargetData: true}, function(response) {
    if (response.targetData)
        console.log('activate the weapons');
        chrome.runtime.sendMessage(id, {activateLasers: true});
  });

manifest.json

{
  "manifest_version": 2,

  "name": "comunication app",
  "description": "Testing chrome cross extension comunication",
  "version": "2.0.20",

    "background": {
    "scripts": ["background.js"]
  },


  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click here!"
  },
  "permissions": [
    "activeTab",
    "https://ajax.googleapis.com/",
    "tabs",
    "http://*/*", "https://*/*", "background"
  ]
}