Examine source code of YAFFeather

{
  "manifest_version": 2,
  "name": "YAFFeather",
  "version": "3.8.1",
  "description": "Yet Another Fork of Feather. Originally by sw33ze, tweaked by Alex.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.nationstates.net/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "settings.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yaffeather@alexfromnationstates"
    }
  }
}