Examine source code of Fast translator

{
  "manifest_version": 2,
  "name": "Fast translator",
  "version": "1.1resigned1",
  "description": "Select any word on page, and press 't' three times to view translated phrase!",
  "icons": {
    "48": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "fast-translator@lidev.ru",
      "strict_min_version": "48.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "dist/fast-translator.bundle.js"
      ]
    }
  ],
  "permissions": [
    "webRequest",
    "https://translate.googleapis.com/"
  ]
}