Examine source code of Cream on Gray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cream on Gray",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(10, 10, 10)",
      "toolbar_text": "rgb(255, 238, 159)",
      "frame": "rgb(10, 10, 10)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(192, 192, 192)",
      "toolbar_field_text": "rgb(183, 2, 49)",
      "tab_line": "rgb(220, 220, 220)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(220, 220, 220)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3dbb6acd-98c4-474c-82d4-6e0733b821e7}"
    }
  }
}