Examine source code of Theme

{
  "name": "Yellow theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "img1.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(176, 163, 42, 0.62)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(227, 201, 109, 0.72)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a627b2df-be26-457d-bc18-6a952bcb5048}"
    }
  }
}