Examine source code of PitBulk Opener

{
  "manifest_version": 2,
  "name": "PitBulk Opener",
  "description": "This extension allows you to open URLs one by one.",
  "author": "EHOT",
  "version": "1.5resigned1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "PitBulk Opener",
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1ebfd8e-bba1-4174-9970-e154caacc6de}"
    }
  }
}