Examine source code of CleanTabs

{
  "manifest_version": 2,
  "name": "CleanTabs",
  "description": "Auto discard (sleep) / close tabs based on rules.",
  "version": "1.0.3",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms"
  ],
  "content_security_policy": "script-src 'self' 'wasm-unsafe-eval' http://localhost:3000; object-src 'self';",
  "web_accessible_resources": [
    "lib/*"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+T",
        "mac": "MacCtrl+T"
      },
      "description": "Show the popup"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff31460c-43c4-494a-a350-a1c61506036e}"
    }
  }
}