Examine source code of AB Add on

{
  "manifest_version": 2,
  "name": "AB Add on",
  "version": "1.0",
  "description": "AB Add-on",
  "icons": {
    "128": "icons/icon.png"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e01d69f8-f936-476a-a572-52011ceb471c}"
    }
  }
}