Examine source code of Darkwithblue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "bbb",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-020-48c286b34e53380d46803c2e5603a5b2.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 10)",
      "toolbar_text": "rgb(181, 181, 181)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(225, 225, 225)",
      "toolbar_field": "rgb(34, 34, 34)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(13, 29, 208)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(200, 215, 232)",
      "icons": "rgb(99, 112, 193)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(144, 146, 144)",
      "tab_loading": "rgb(13, 29, 208)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b985e20e-c38e-4833-ae09-37a03969d8ad}"
    }
  }
}