Examine source code of Local Storage Explorer

{
  "manifest_version": 2,
  "name": "Local Storage Explorer",
  "short_name": "StorageXplorer",
  "version": "1.1.6",
  "description": "LocalStorage and sessionStorage explorer embedded in the Firefox Developer Tools.",
  "icons": {
    "38": "imgs/38.png",
    "48": "imgs/48.png",
    "128": "imgs/128.png"
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "devtools_page": "loader.html",
  "applications": {
    "gecko": {
      "id": "@storagexplorer",
      "strict_min_version": "55.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": false
  },
  "web_accessible_resources": [
    "options.html"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}