Examine source code of Episode Progress Syncer

{
  "manifest_version": 2,
  "name": "Episode Progress Syncer",
  "version": "1.0",
  "description": "Sync and display episode progress per-episode.",
  "browser_specific_settings": {
    "gecko": {
      "id": "episodeprogress@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  }
}