Examine source code of PAC Extensions

{
  "name": "PAC Extensions",
  "description": "Peace And Cube ",
  "version": "1.0",
  "browser_action": {
    "default_popup": "pac.html",
    "default_icon": "pac_extensions.png"
  },
  "manifest_version": 2,
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      },
      "description": "Opens pac.html"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{214098d8-595a-446d-9ae5-3292c5438fa1}"
    }
  }
}