Examine source code of Vampire-Devil3

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Vampire-Devil3",
  "theme": {
    "images": {
      "additional_backgrounds": []
    },
    "properties": {
      "additional_backgrounds_alignment": [],
      "additional_backgrounds_tiling": []
    },
    "colors": {
      "toolbar": "rgba(225, 234, 239, 0)",
      "toolbar_text": "rgb(247, 247, 247)",
      "frame": "rgb(199, 199, 199)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(141, 248, 112)",
      "popup": "rgb(217, 217, 217)",
      "popup_text": "rgb(11, 11, 11)",
      "tab_loading": "rgb(141, 248, 112)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ad93f2a-4511-4d35-afd4-d3541bba3561}"
    }
  }
}