Examine source code of Purple Bruise

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Purple bruise",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(145, 0, 255)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(145, 0, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(234, 0, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 0, 4)",
      "popup": "rgba(0, 28, 255, 0.29)",
      "popup_text": "rgb(159, 0, 255)",
      "tab_loading": "rgb(255, 0, 4)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9611a384-32d3-4bef-9e57-98763b725dd0}"
    }
  }
}