Examine source code of My own blue theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "My own blue theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 12, 101, 0.01)",
      "toolbar_text": "rgb(250, 241, 136)",
      "frame": "rgb(0, 12, 101)",
      "tab_background_text": "rgb(103, 147, 227)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(2, 90, 251)",
      "popup": "rgb(0, 12, 101)",
      "popup_text": "rgb(250, 241, 136)",
      "button_background_active": "rgb(0, 62, 255)",
      "button_background_hover": "rgb(65, 71, 158)",
      "icons_attention": "rgb(69, 230, 10)",
      "icons": "rgb(103, 147, 227)",
      "popup_border": "rgb(2, 90, 251)",
      "tab_loading": "rgba(1, 255, 248, 0.97)",
      "tab_selected": "rgb(4, 88, 145)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(2, 90, 251)",
      "toolbar_field_border": "rgba(109, 0, 255, 0.91)",
      "toolbar_field_focus": "rgb(4, 88, 145)",
      "toolbar_field_text_focus": "rgb(250, 241, 136)",
      "toolbar_top_separator": "rgb(0, 62, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{35b8804d-2cd6-4472-b306-15f17d26e0de}"
    }
  }
}