Examine source code of SWIFT

{
  "name": "SWIFT",
  "version": "1.5.0",
  "manifest_version": 2,
  "description": "An extension to keep you safe online.",
  "browser_action": {
    "default_icon": "icons/icon-128.png",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "ext/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "webRequest",
    "storage",
    "identity"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "optional_permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{17839436-619a-4ab1-a192-86594e6877f2}"
    }
  }
}