Examine source code of Paste Enabler

{
  "description": "Application that allows you to paste into a web page, even if it is blocked.",
  "manifest_version": 2,
  "name": "Paste Enabler",
  "version": "0.1",
  "homepage_url": "https://pujol.fr.eu.org/",
  "icons": {
    "48": "icons/icon48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24d7221c-3b58-4e9d-835e-eb7bab195575}"
    }
  }
}