Examine source code of Ancience (Monochromatic)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Ancience (Monochromatic)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-016-af8c49de75012ca2c007f953ff2e4499.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(151, 151, 151)",
      "toolbar_text": "rgb(49, 49, 49)",
      "frame": "rgb(49, 48, 48)",
      "tab_background_text": "rgb(102, 102, 102)",
      "toolbar_field": "rgb(150, 150, 150)",
      "toolbar_field_text": "rgb(52, 52, 52)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(0, 0, 0, 0.9)",
      "popup_text": "rgb(218, 218, 218)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ca64b14-eb19-4232-9338-89c42da6b056}"
    }
  }
}