Examine source code of Zipcode Weather

{
  "manifest_version": 2,
  "name": "Zipcode Weather",
  "version": "1.6",
  "description": "Never forget your raincoat",
  "permissions": [
    "storage",
    "http://api.openweathermap.org/*",
    "http://jucafu.com/config",
    "https://trends.google.com/*",
    "*://fes_cps.cps.ampfeed.com/*",
    "*://ff.search.yahoo.com/*",
    "*://*.google.com/*",
    "*://search.yahoo.com/sugg/gossip/gossip-us-ura/*"
  ],
  "web_accessible_resources": [
    "data/*",
    "*://*.google.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Zipcode Weather",
      "keyword": "zipcode",
      "search_url": "https://zipcode-weather.com/search?t=e&ch=1&q={searchTerms}",
      "favicon_url": "https://zipcode-weather.com/favicon.ico",
      "suggest_url": "https://search.yahoo.com/sugg/gossip/gossip-us-ura/?command={searchTerms}&output=fxjson",
      "search_url_post_params": "search_lang=__MSG_url_domain__",
      "suggest_url_post_params": "suggest_lang=__MSG_url_domain__",
      "encoding": "UTF-8",
      "is_default": true
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icon/icon16.png",
      "32": "icon/icon32.png",
      "48": "icon/icon48.png",
      "128": "icon/icon128.png"
    }
  },
  "icons": {
    "16": "icon/icon16.png",
    "32": "icon/icon32.png",
    "48": "icon/icon48.png",
    "128": "icon/icon128.png"
  },
  "applications": {
    "gecko": {
      "id": "andrey.serp@bpmms.com",
      "strict_min_version": "53.0"
    }
  }
}