Examine source code of PhotoPasta

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "trustmaster@kodigy.com"
    }
  },
  "name": "PhotoPasta",
  "version": "1.0",
  "description": "Copy direct image URLs from Google Photos and paste them into PhotoPasta shortcodes.",
  "icons": {
    "16": "images/icon-16.png",
    "24": "images/icon-24.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "action": {
    "default_icon": "images/icon-24.png",
    "default_title": "PhotoPasta settings",
    "default_popup": "src/options.html"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://photos.google.com/*"
      ],
      "js": [
        "src/content.js"
      ],
      "css": [
        "src/content.css"
      ],
      "run_at": "document_end"
    }
  ],
  "host_permissions": [
    "https://photos.google.com/*"
  ],
  "permissions": [
    "storage",
    "scripting",
    "activeTab",
    "notifications",
    "contextMenus"
  ]
}