Examine source code of Clipboard Manager

{
  "manifest_version": 2,
  "name": "Clipboard Manager",
  "version": "1.0",
  "description": "Save, view, and reuse clipboard history easily.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Clipboard Manager",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dediakar.i.d.ia.436@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "clipboardRead",
    "clipboardWrite",
    "storage",
    "activeTab"
  ]
}