Examine source code of Blue & Grey Compass

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue & Grey Compass",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-006-51ab495c5f5dde6a3cddb22484acd00d.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(42, 66, 91, 0.68)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(50, 50, 53)",
      "tab_background_text": "rgb(177, 187, 187)",
      "toolbar_field": "rgb(45, 76, 101)",
      "toolbar_field_text": "rgb(241, 237, 237)",
      "tab_line": "rgb(27, 120, 198)",
      "popup": "rgb(31, 33, 34)",
      "popup_text": "rgb(229, 229, 229)",
      "button_background_active": "rgba(43, 71, 94, 0.68)",
      "button_background_hover": "rgba(8, 116, 151, 0.68)",
      "frame_inactive": "rgb(65, 66, 72)",
      "icons_attention": "rgba(71, 122, 154, 0.93)",
      "icons": "rgba(229, 230, 233, 0.78)",
      "ntp_text": "rgba(255, 255, 255, 0.93)",
      "popup_border": "rgba(50, 42, 90, 0)",
      "tab_loading": "rgb(79, 121, 142)",
      "tab_selected": "rgba(34, 89, 120, 0.68)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(24, 90, 146)",
      "toolbar_field_border": "rgb(27, 111, 180)",
      "toolbar_field_focus": "rgb(52, 52, 53)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(81, 119, 159)",
      "toolbar_field_text_focus": "rgb(182, 186, 189)",
      "toolbar_top_separator": "rgba(0, 80, 124, 0.12)",
      "toolbar_vertical_separator": "rgb(65, 136, 162)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{abaeab8f-ddfe-4562-865b-4456b58bb9f6}"
    }
  }
}