Examine source code of Rainwave automation

{
  "manifest_version": 3,
  "name": "Rainwave automation",
  "description": "Adds automation features, auto voting and requests, to rainwave.cc",
  "version": "1.3.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "main-world.js"
      ],
      "matches": [
        "https://rainwave.cc/*"
      ]
    }
  ],
  "permissions": [
    "cookies",
    "storage"
  ],
  "host_permissions": [
    "https://rainwave.cc/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@rainwave-automation",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_icon": {
      "16": "/icons/16.png",
      "32": "/icons/32.png",
      "64": "/icons/64.png",
      "128": "/icons/128.png"
    },
    "default_title": "Rainwave automation options",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://rainwave.cc/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}