Examine source code of Extension-master

{
  "manifest_version": 2,
  "name": "Save to WebCull",
  "version": "1.0.1",
  "description": "A plugin that makes it easier to save bookmarks to the WebCull bookmark manager.",
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webNavigation",
    "tabs",
    "cookies"
  ],
  "page_action": {
    "default_title": "Add to WebCull",
    "default_icon": {
      "16": "images/webcull-16x.png",
      "32": "images/webcull-32x.png",
      "48": "images/webcull-48x.png",
      "128": "images/webcull-128x.png"
    },
    "default_popup": "views/bootstrap.html"
  },
  "background": {
    "scripts": [
      "js/lib/q.js",
      "js/lib/lib.js",
      "js/background/background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "images/webcull-16x.png",
    "32": "images/webcull-32x.png",
    "48": "images/webcull-48x.png",
    "128": "images/webcull-128x.png"
  },
  "content_security_policy": "script-src 'self' https://webcull.com; object-src 'self'"
}