Examine source code of Grey & Dark Blue

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Grey & Dark Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(28, 65, 97)",
      "toolbar_text": "rgb(88, 151, 223)",
      "frame": "rgb(155, 170, 184)",
      "tab_background_text": "rgb(40, 46, 53)",
      "toolbar_field": "rgb(213, 215, 217)",
      "toolbar_field_text": "rgb(43, 49, 55)",
      "tab_line": "rgb(74, 79, 81)",
      "popup": "rgb(235, 235, 235)",
      "popup_text": "rgb(32, 106, 150)",
      "icons_attention": "rgb(32, 106, 150)",
      "popup_highlight": "rgb(32, 106, 150)",
      "sidebar_text": "rgb(28, 65, 97)",
      "toolbar_bottom_separator": "rgb(28, 65, 97)",
      "toolbar_field_highlight": "rgb(32, 106, 150)",
      "toolbar_top_separator": "rgb(28, 65, 97)",
      "tab_loading": "rgb(74, 79, 81)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c06fe245-27f2-4bc7-b5a6-db8ff7af6b2b}"
    }
  }
}