Examine source code of Font Auto-resizer

{
  "manifest_version": 2,
  "name": "Font Auto-resizer",
  "version": "1.2resigned1",
  "icons": {
    "48": "icon_48.png"
  },
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "run_at": "document_idle",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "far.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "{3711b0ae-bc5d-4002-acc6-81efa015dc40}"
    }
  }
}