Examine source code of Kinen - Save to Library

{
  "manifest_version": 2,
  "name": "Kinen — Save to Library",
  "description": "Save any page to your Kinen library with one click",
  "version": "1.0.0",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "activeTab",
    "cookies",
    "https://kinen.app/*",
    "http://127.0.0.1:3000/*",
    "http://localhost:3000/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@kinen.app",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://kinen.app/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}