Examine source code of VLibras Plugin

{
  "manifest_version": 2,
  "name": "VLibras",
  "version": "6.4.0",
  "description": "Um tradutor de Português para Libras.",
  "homepage_url": "http://vlibras.lavid.ufpb.br/",
  "icons": {
    "16": "icons/vlibras16.png",
    "48": "icons/vlibras48.png",
    "128": "icons/vlibras128.png"
  },
  "permissions": [
    "contextMenus",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_security_policy": "default-src 'self' blob:; script-src 'self' 'unsafe-eval' blob:;  connect-src *; style-src * 'unsafe-inline' 'self' blob:; img-src 'self' data:; font-src 'self' data:;",
  "browser_specific_settings": {
    "gecko": {
      "id": "@vlibras-plugin"
    }
  }
}