Examine source code of Roll20 Player Roll Stats

{
  "manifest_version": 3,
  "name": "Roll20 Player Roll Stats",
  "version": "1.0.0",
  "description": "Tracks Roll20 dice averages and player roll stats, including manual rolls, player merging, graphs, and exports.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://app.roll20.net/*"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_title": "Roll20 Player Roll Stats",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "64": "icons/icon64.png",
      "96": "icons/icon96.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://app.roll20.net/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "roll20-player-roll-stats@digidestined.online",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}