Examine source code of Testizy

{
  "name": "Testizy",
  "description": "Manage your test plans directly from your browser",
  "version": "2.7resigned1",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "MacCtrl+Shift+K"
      },
      "description": "Open Testizy"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{35b9dc52-674b-49a5-9319-9441607a77e6}"
    }
  }
}