Examine source code of Allow Copy Advanced

{
  "manifest_version": 2,
  "name": "Allow Copy",
  "description": "Restore the ability to copy text, save images, and enable right-click on websites.",
  "default_locale": "en",
  "author": "Curly Doggo Limited",
  "homepage_url": "https://curlydoggo.com/allow-copy",
  "version": "1.0.0",
  "icons": {
    "128": "images/icon-active.png"
  },
  "permissions": [
    "*://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.bundle.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.bundle.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "128": "images/icon-inactive.png"
    },
    "default_title": "Allow Copy"
  },
  "web_accessible_resources": [
    "images/icon-active.png",
    "images/icon-inactive.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fdcff16f-20c8-48f9-ad28-012a09aeca6d}"
    }
  }
}