Examine source code of akGrey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "akGrey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(68, 68, 68, 0.65)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(12, 12, 12)",
      "tab_background_text": "rgb(153, 149, 153)",
      "toolbar_field": "rgba(0, 0, 0, 0.84)",
      "toolbar_field_text": "rgb(215, 216, 231)",
      "tab_line": "rgb(128, 14, 115)",
      "popup": "rgba(93, 90, 94, 0.75)",
      "popup_text": "rgb(255, 255, 255)",
      "icons": "rgb(197, 195, 197)",
      "ntp_background": "rgb(59, 59, 60)",
      "ntp_text": "rgb(254, 254, 254)",
      "popup_highlight_text": "rgb(227, 219, 227)",
      "tab_loading": "rgb(128, 14, 115)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{72d5bea1-0779-4566-8820-b55fab14a2a4}"
    }
  }
}