Examine source code of We got the 'BLUES'

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "yo",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(131, 79, 198)",
      "toolbar_text": "rgb(156, 240, 214)",
      "frame": "rgb(55, 14, 117)",
      "tab_background_text": "rgb(189, 244, 255)",
      "toolbar_field": "rgb(38, 72, 102)",
      "toolbar_field_text": "rgb(0, 214, 255)",
      "tab_line": "rgb(164, 241, 255)",
      "popup": "rgb(6, 48, 99)",
      "popup_text": "rgb(187, 244, 255)",
      "button_background_hover": "rgba(179, 255, 249, 0.46)",
      "icons": "rgb(162, 162, 240)",
      "popup_border": "rgba(149, 150, 234, 0.94)",
      "tab_loading": "rgb(164, 241, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{682a867f-5652-449e-9397-5d928263a54d}"
    }
  }
}