Examine source code of zuckBlock

{
  "name": "zuckBlock",
  "version": "1.0.1resigned1",
  "description": "Blocks Facebook from your computer.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.facebook.com/",
    "*://*.fb.com/",
    "activeTab",
    "storage",
    "declarativeContent"
  ],
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "page_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/16.png",
      "32": "images/32.png",
      "48": "images/48.png",
      "128": "images/128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{03e66e86-d272-4a46-8f4d-703fece43e4e}"
    }
  }
}