Examine source code of InstaStack

{
  "manifest_version": 2,
  "name": "stackoverflow_assistent",
  "version": "1.0",
  "icons": {
    "48": "icons/icons8-copy-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.stackoverflow.com/*"
      ],
      "js": [
        "stacky.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/icons8-copy-48.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8aa8f055-89d9-458f-9274-4d8a50cae629}"
    }
  }
}