Examine source code of Emotion Overlay

{
  "manifest_version": 3,
  "name": "Emotion Overlay",
  "description": "Real-time emotion overlay for videos based on subtitles or tags.",
  "version": "1.0.1",
  "icons": {
    "48": "icon48.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "emotion-overlay@amo",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}