Examine source code of My Clipboard plus

{
  "manifest_version": 2,
  "name": "Modern Clipboard History",
  "version": "3.0",
  "description": "Shows your clipboard history in a modern popup with favorites",
  "permissions": [
    "storage",
    "clipboardRead",
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{55b60a44-ca57-4d8b-b78a-e7ed6d728f38}"
    }
  }
}