Examine source code of purple_gradation

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "purple_gradation",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(204, 166, 191)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(180, 76, 151)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0.7)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(236, 246, 236)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b16b6e63-f2b5-40f8-b578-1f6376e46a61}"
    }
  }
}