Examine source code of CapturePage

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.0.9resigned1",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "author": "AnthonyLeborgne",
  "applications": {
    "gecko": {
      "id": "capturePage@example.com",
      "strict_min_version": "55.0"
    }
  },
  "icons": {
    "32": "icons/shutter-32.png",
    "48": "icons/shutter-48.png",
    "64": "icons/shutter-64.png",
    "96": "icons/shutter-96.png"
  },
  "browser_action": {
    "default_icon": "icons/shutter-32.png",
    "default_title": "__MSG_extensionActionTitle__"
  },
  "permissions": [
    "tabs",
    "downloads",
    "storage",
    "menus",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "storage.js",
      "background-script.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ]
}