Examine source code of CommonThread

{
  "manifest_version": 2,
  "name": "CommonThread",
  "version": "1.0",
  "description": "Comment on any website.",
  "icons": {
    "48": "icons/icon48.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "commonthread@entertomyworld.com",
      "strict_min_version": "60.0"
    }
  }
}