Examine source code of Netmon

{
  "name": "Netmon",
  "version": "1.0",
  "description": "Network monitor, view the HTTP headers of the current page, or globally, from all tabs.",
  "homepage_url": "https://github.com/kpion/netmon",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "http://*/",
    "https://*/"
  ],
  "background": {
    "page": "background/index.html"
  },
  "browser_action": {
    "default_popup": "modules/list/index.html?mode=popup",
    "default_icon": {
      "16": "static/images/extension-icon.png",
      "32": "static/images/extension-icon.png",
      "48": "static/images/extension-icon.png",
      "128": "static/images/extension-icon.png"
    }
  },
  "icons": {
    "16": "static/images/extension-icon.png",
    "32": "static/images/extension-icon.png",
    "48": "static/images/extension-icon.png",
    "128": "static/images/extension-icon.png"
  },
  "manifest_version": 2
}