Examine source code of Gimloader

{
  "name": "Gimloader",
  "description": "An extension that lets you use plugins to customize Gimkit",
  "version": "1.12.6",
  "manifest_version": 3,
  "action": {
    "default_popup": "popup.html",
    "default_icon": "images/icon128.png"
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "js": [
        "js/relay/index.js"
      ],
      "matches": [
        "https://www.gimkit.com/*",
        "https://gimloader.github.io/*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "js/content/gimloader.js"
      ],
      "matches": [
        "https://www.gimkit.com/*"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    }
  ],
  "background": {
    "scripts": [
      "js/background/index.js"
    ]
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "edit_csp",
        "enabled": true,
        "path": "edit_csp.json"
      },
      {
        "id": "block_scripts",
        "enabled": true,
        "path": "block_scripts.json"
      }
    ]
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "http://localhost:5822/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gimloader@thelazysquid.github.io"
    }
  }
}