Examine source code of Between the days

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Between the days",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-022-0e8aa16bfcfce2449791412d89f3a92b.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(47, 46, 48)",
      "toolbar_text": "rgb(255, 250, 228)",
      "frame": "rgb(29, 17, 40)",
      "tab_background_text": "rgb(255, 250, 228)",
      "toolbar_field": "rgb(255, 250, 228)",
      "toolbar_field_text": "rgb(83, 91, 255)",
      "tab_line": "rgb(83, 91, 255)",
      "popup": "rgb(29, 17, 40)",
      "popup_text": "rgb(255, 250, 228)",
      "ntp_background": "rgb(47, 46, 48)",
      "ntp_text": "rgb(255, 250, 228)",
      "tab_loading": "rgb(83, 91, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4bb4b19-d382-404e-ae1e-cf3f27020027}"
    }
  }
}