Examine source code of Daybreak Gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Daybreak Gradient",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-y"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.44)",
      "toolbar_text": "rgb(152, 0, 255)",
      "frame": "rgb(167, 201, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(232, 241, 255)",
      "toolbar_field_text": "rgb(0, 11, 191)",
      "tab_line": "rgb(255, 0, 185)",
      "popup": "rgb(255, 244, 252)",
      "popup_text": "rgb(63, 68, 155)",
      "icons_attention": "rgb(184, 94, 245)",
      "icons": "rgb(152, 0, 255)",
      "popup_border": "rgb(94, 158, 255)",
      "tab_background_separator": "rgb(0, 0, 0)",
      "tab_selected": "rgb(196, 219, 255)",
      "tab_text": "rgb(74, 79, 179)",
      "toolbar_field_border_focus": "rgb(184, 94, 245)",
      "toolbar_field_highlight": "rgb(59, 137, 255)",
      "tab_loading": "rgb(255, 0, 185)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f07fd784-9012-4703-8ebf-d763c3a8a384}"
    }
  }
}