Examine source code of Fouineur

{
  "manifest_version": 2,
  "name": "Fouineur",
  "description": "Plot profiler markers",
  "version": "0.0.12",
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon2x.png"
  },
  "background": {
    "scripts": [
      "background_script.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon.png",
      "96": "icons/icon2x.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://profiler.firefox.com/*"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b0d22c14-a024-480b-9e7c-aab455be404b}"
    }
  }
}