Examine source code of View Source Toggle

{
  "manifest_version": 2,
  "name": "View Source Toggle",
  "version": "1.0",
  "description": "Toggle 'view-source:' on the current page.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Toggle view source",
    "default_icon": "icon.svg"
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "view-source-toggle@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}