Examine source code of AdBlocker Shield

{
  "manifest_version": 2,
  "name": "AdBlocker Shield",
  "version": "1.0.0",
  "description": "Boost your browsing speed while blocking ads with AdBlocker Shield",
  "permissions": [
    "activeTab",
    "declarativeNetRequest",
    "notifications",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "img/icon16.png",
      "48": "img/icon48.png",
      "128": "img/icon128.png"
    }
  },
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07000273-ee29-4856-9ef7-377bfa1a2aa5}"
    }
  }
}