Examine source code of Simple Purple for Firefox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simple Purple",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-018-0ca3dfc7bb661ec53999d358812ce0ab.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(60, 0, 60)",
      "toolbar_text": "rgb(255, 183, 255)",
      "frame": "rgb(37, 0, 37)",
      "tab_background_text": "rgb(186, 0, 186)",
      "toolbar_field": "rgb(80, 40, 80)",
      "toolbar_field_text": "rgb(255, 183, 255)",
      "tab_line": "rgb(255, 0, 255)",
      "popup": "rgb(37, 0, 37)",
      "popup_text": "rgb(255, 183, 255)",
      "button_background_active": "rgb(37, 0, 37)",
      "icons": "rgb(255, 48, 255)",
      "ntp_background": "rgb(60, 0, 60)",
      "popup_border": "rgb(186, 0, 186)",
      "tab_selected": "rgb(78, 0, 78)",
      "tab_loading": "rgb(255, 0, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3988a07d-614d-42e9-a9f6-7caae449cf26}"
    }
  }
}