Examine source code of Copy annotation

{
  "manifest_version": 2,
  "version": "0.0.1",
  "name": "Copy annotation",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icon_16.png",
    "19": "icon_19.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "browser_action": {
    "default_icon": "icon_19.png"
  },
  "commands": {
    "copy-page-element": {
      "suggested_key": {
        "default": "Alt+Y"
      },
      "description": "Copy annotation"
    }
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9a177992-8377-456b-a714-008f09c9e713}"
    }
  }
}