Examine source code of purple stars

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "purple stars",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(39, 16, 56)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(222, 178, 245, 0.41)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(210, 143, 244)",
      "popup": "rgb(192, 153, 217)",
      "popup_text": "rgb(39, 16, 56)",
      "button_background_active": "rgba(189, 138, 230, 0.8)",
      "button_background_hover": "rgba(189, 138, 230, 0.8)",
      "icons_attention": "rgba(255, 171, 236, 0.8)",
      "icons": "rgb(210, 143, 244)",
      "ntp_background": "rgb(23, 0, 40)",
      "ntp_text": "rgb(210, 143, 244)",
      "popup_border": "rgb(39, 16, 56)",
      "sidebar_border": "rgb(39, 16, 56)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(118, 81, 166)",
      "sidebar_text": "rgb(39, 16, 56)",
      "sidebar": "rgb(192, 153, 217)",
      "toolbar_field_border_focus": "rgb(37, 0, 62)",
      "toolbar_field_border": "rgba(255, 255, 255, 0.35)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(118, 81, 166)",
      "tab_loading": "rgb(210, 143, 244)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{41299153-1b9f-4e55-804f-cc99325c70c5}"
    }
  }
}