Examine source code of RoyalRefresh

{
  "manifest_version": 2,
  "name": "RoyalRefresh",
  "description": "A web extension for royalroad.com. For people who juggle multiple stories",
  "version": "1.7.1",
  "icons": {
    "48": "icons/royalroad_48.png",
    "96": "icons/royalroad_96.png",
    "128": "icons/royalroad_128.png"
  },
  "homepage_url": "https://github.com/Seismix/royalrefresh",
  "permissions": [
    "storage",
    "*://*.royalroad.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "royalrefresh.extension@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {}
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "RoyalRefresh",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.royalroad.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}