Examine source code of Roo Wager Widget

{
  "manifest_version": 3,
  "name": "Roo Wager Widget",
  "version": "1.2",
  "permissions": [
    "tabs",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "*://roobet.com/*",
    "*://wager.ddk.gg/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "roowager@onlytk.extension",
      "strict_min_version": "42.0"
    }
  }
}