Examine source code of stylextension

{
  "manifest_version": 2,
  "name": "stylextension",
  "version": "1.2resigned1",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "toggle-tab": {
      "suggested_key": {
        "default": "Alt+Shift+I"
      },
      "description": "Toggle styling for the current tab"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "applications": {
    "gecko": {
      "id": "stylextension@koneu.eu"
    }
  }
}