Examine source code of ThemeBlue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "ThemeBlue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(101, 101, 104)",
      "toolbar_text": "rgb(15, 15, 15)",
      "frame": "rgb(8, 11, 33)",
      "tab_background_text": "rgb(165, 197, 255)",
      "toolbar_field": "rgb(7, 7, 7)",
      "toolbar_field_text": "rgb(223, 223, 223)",
      "tab_line": "rgb(41, 41, 41)",
      "popup": "rgb(36, 78, 65)",
      "popup_text": "rgb(132, 136, 135)",
      "tab_loading": "rgb(41, 41, 41)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4ad965f-0620-478a-9586-0de149a391da}"
    }
  }
}