Examine source code of Midday forest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Midday forest",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(10, 101, 74)",
      "toolbar_text": "rgb(19, 232, 167)",
      "frame": "rgb(10, 101, 74)",
      "tab_background_text": "rgb(55, 166, 131)",
      "toolbar_field": "rgb(201, 232, 222)",
      "toolbar_field_text": "rgb(143, 147, 222)",
      "tab_line": "rgb(19, 232, 167)",
      "popup": "rgb(201, 232, 222)",
      "popup_text": "rgb(143, 147, 222)",
      "tab_loading": "rgb(19, 232, 167)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{674a15a3-8f3a-4fed-8842-3401d81bb71d}"
    }
  }
}