Examine source code of Dont do Drugs

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Drugs",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "left top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(225, 234, 239, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 3, 3)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(2, 219, 0)",
      "popup": "rgb(172, 59, 193)",
      "popup_text": "rgb(0, 255, 212)",
      "tab_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(2, 219, 0)"
    }
  }
}