Examine source code of Error Toast

{
  "manifest_version": 2,
  "name": "Error Toast",
  "version": "2.0",
  "description": "Affiche les erreurs et warnings des sites web dans un toast",
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "webRequest",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "page-script.js"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icon48.png",
      "96": "icon96.png"
    },
    "default_popup": "popup.html",
    "default_title": "Error Toast"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "error-toast@czsyn.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}