Examine source code of SelectMe

{
  "manifest_version": 2,
  "name": "SelectMe",
  "version": "0.3resigned1",
  "description": "Makes text on readlightnovel.org selectable.",
  "icons": {
    "48": "icons/SelectMe.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.readlightnovel.org/*"
      ],
      "js": [
        "SelectMe.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6da41402-7f9e-49b9-a76c-4dedf14818e7}"
    }
  }
}