Examine source code of AmazonClip

{
  "manifest_version": 3,
  "name": "AmazonClip",
  "version": "3.3.1",
  "description": "Copy amazon associates link to clipboard.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{c7b65ba2-2783-465f-b593-d7d3e2c1b643}"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "*.js"
      ],
      "matches": [
        "https://www.amazon.com/*",
        "https://www.amazon.co.jp/*",
        "https://www.amazon.co.uk/*",
        "https://www.amazon.fr/*",
        "https://www.amazon.de/*,",
        "https://www.amazon.ca/*",
        "https://www.amazon.cn/*",
        "https://www.amazon.it/*"
      ]
    }
  ],
  "page_action": {
    "browser_style": true,
    "default_icon": "images/action.png",
    "default_title": "AmazonClip",
    "default_popup": "popup.html",
    "show_matches": [
      "https://www.amazon.com/*",
      "https://www.amazon.co.jp/*",
      "https://www.amazon.co.uk/*",
      "https://www.amazon.fr/*",
      "https://www.amazon.de/*,",
      "https://www.amazon.ca/*",
      "https://www.amazon.cn/*",
      "https://www.amazon.it/*"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "icons": {
    "16": "images/16.png",
    "32": "images/32.png",
    "48": "images/48.png",
    "128": "images/128.png"
  }
}