Examine source code of Charcoal-Ash

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Charcoal-Ash",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(34, 35, 34)",
      "toolbar_text": "rgb(212, 203, 212)",
      "frame": "rgb(26, 27, 26)",
      "tab_background_text": "rgb(212, 203, 212)",
      "toolbar_field": "rgb(63, 66, 63)",
      "toolbar_field_text": "rgb(212, 203, 212)",
      "tab_line": "rgb(212, 203, 212)",
      "popup": "rgb(63, 66, 63)",
      "popup_text": "rgb(212, 203, 212)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0.54)",
      "toolbar_field_highlight": "rgba(40, 41, 40, 0.98)",
      "tab_loading": "rgb(212, 203, 212)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{72da200d-8373-431e-ae11-d8e0f4b57d51}"
    }
  }
}