Examine source code of Clipboard Manager

{
  "manifest_version": 2,
  "name": "Clipboard Manager",
  "version": "4.0",
  "description": "manager your copy text and control",
  "permissions": [
    "storage",
    "clipboardRead",
    "activeTab",
    "<all_urls>",
    "declarativeNetRequestWithHostAccess"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d8c16402-7cc6-4cf9-bb93-593bb560c93f}"
    }
  }
}