Examine source code of Site Slayer

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "siteslayer@ndaoud360",
      "strict_min_version": "109.0"
    }
  },
  "data_collection_permissions": {
    "required": []
  },
  "name": "Site Slayer",
  "short_name": "SiteSlayer",
  "version": "1.9",
  "description": "Turn any website into a playable level. Destroy elements, battle enemies, and climb the leaderboard!",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Activate Site Slayer"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "scripting",
    "tabs",
    "storage",
    "downloads",
    "notifications",
    "alarms",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "enemy.png",
        "ships/*.png",
        "ships/*/*.png",
        "ships/*/*.gif",
        "ships/standard/*",
        "ships/speedy/*",
        "ships/heavy/*",
        "ships/stealth/*",
        "ships/custom/*",
        "ships/light/*",
        "ships/orbital/dark/*",
        "ships/orbital/light/*",
        "audio/*.mp3",
        "audio/*.wav",
        "audio/*.ogg",
        "achievements-data.js",
        "leaderboard.js",
        "multiplayer.js",
        "multiplayer-mode.js",
        "SiteSlayerPurple.png",
        "SiteSlayerBlue.png",
        "SiteSlayerOrange.png",
        "SiteSlayerGreen.png",
        "SiteSlayerPink.png",
        "SiteSlayerStealth.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "commands": {
    "toggle-game": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "Command+Shift+K"
      },
      "description": "Toggle Game On/Off"
    }
  }
}