Examine source code of Copy Document

{
  "manifest_version": 2,
  "name": "Copy Document",
  "version": "1.0",
  "description": "Copy Document to with Single Mouse Click",
  "icons": {
    "32": "icons/doc_32.png",
    "48": "icons/doc_48.png",
    "96": "icons/doc_96.png",
    "128": "icons/doc_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "clipboardWrite",
    "menus"
  ],
  "browser_action": {
    "default_icon": "icons/doc_48.png",
    "default_title": "Copy Document"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}