Examine source code of decent blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "decent blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(241, 242, 255, 0.91)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(50, 57, 143)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(70, 35, 205)",
      "popup": "rgba(255, 255, 255, 0.97)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(255, 255, 255)",
      "button_background_hover": "rgba(24, 24, 166, 0.26)",
      "frame_inactive": "rgb(229, 230, 238)",
      "icons_attention": "rgba(0, 16, 250, 0.7)",
      "ntp_background": "rgb(247, 248, 255)",
      "popup_border": "rgb(10, 36, 213)",
      "sidebar_highlight_text": "rgb(3, 7, 159)",
      "sidebar_text": "rgb(0, 0, 0)",
      "sidebar": "rgb(255, 255, 255)",
      "tab_loading": "rgba(0, 16, 250, 0.75)",
      "tab_text": "rgb(3, 3, 141)",
      "toolbar_bottom_separator": "rgb(33, 33, 154)",
      "toolbar_field_border": "rgb(33, 0, 174)",
      "toolbar_field_focus": "rgba(241, 242, 255, 0.96)",
      "toolbar_field_highlight": "rgba(1, 1, 197, 0.69)",
      "toolbar_field_text_focus": "rgb(0, 0, 0)",
      "toolbar_vertical_separator": "rgb(0, 5, 167)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{526396e1-db0d-40d9-b1ca-e96dd5cc9d58}"
    }
  }
}