Examine source code of Coolish blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mine",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(28, 36, 44, 0.92)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(20, 20, 21)",
      "tab_background_text": "rgb(241, 241, 241)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(40, 208, 189)",
      "popup": "rgb(27, 40, 45)",
      "popup_text": "rgb(255, 255, 255)",
      "icons": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(11, 120, 109)",
      "tab_loading": "rgb(40, 208, 189)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6998f7f2-ba9c-4188-8cd6-9eda0ba5c29f}"
    }
  }
}