Examine source code of JavaScript Theme

{
  "name": "JavaScript Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Ontwerp zonder titel(2).png"
    },
    "colors": {
      "frame": "rgba(240, 219, 79, 1)",
      "tab_background_text": "rgba(50, 51, 48, 1)",
      "toolbar": "rgba(248, 250, 225, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.72)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e93e5b0-20a3-49a0-afc6-28a373eae84e}"
    }
  }
}