Examine source code of vue-devtools

{
  "name": "vue-devtools",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "056df39f69e5560ff80140f3ff92cc5f.jpg"
    },
    "colors": {
      "frame": "rgba(172, 189, 224, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  }
}