Examine source code of Dark Galaxy theme

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "dark galaxy theme for firefox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-y"
      ]
    },
    "colors": {
      "toolbar": "rgba(37, 0, 76, 0.69)",
      "toolbar_text": "rgb(165, 160, 171)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(123, 0, 255)",
      "toolbar_field": "rgba(113, 57, 162, 0.29)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(6, 73, 178)",
      "popup": "rgba(113, 57, 162, 0.58)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(6, 73, 178)"
    }
  }
}