Examine source code of mactoven

{
  "manifest_version": 2,
  "name": "mactoven",
  "version": "2.7",
  "description": "convert mac to vendor",
  "icons": {
    "64": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "oleg@powerc.ru",
      "strict_min_version": "48.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "mactoven.js"
      ]
    }
  ]
}