Examine source code of Blue Velvet

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue Velvet",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(36, 22, 75, 0.04)",
      "toolbar_text": "rgb(243, 241, 229)",
      "frame": "rgb(62, 90, 104)",
      "tab_background_text": "rgb(217, 212, 213)",
      "toolbar_field": "rgba(224, 224, 227, 0)",
      "toolbar_field_text": "rgb(185, 181, 154)",
      "tab_line": "rgb(6, 51, 246)",
      "popup": "rgba(0, 6, 50, 0.81)",
      "popup_text": "rgb(242, 242, 193)",
      "button_background_active": "rgba(12, 30, 250, 0.96)",
      "button_background_hover": "rgba(10, 240, 60, 0.04)",
      "frame_inactive": "rgba(230, 28, 11, 0.04)",
      "icons_attention": "rgba(15, 37, 194, 0.69)",
      "icons": "rgba(210, 210, 205, 0.69)",
      "ntp_background": "rgba(5, 1, 36, 0.69)",
      "ntp_text": "rgb(21, 7, 204)",
      "popup_border": "rgba(13, 128, 227, 0.69)",
      "popup_highlight": "rgba(75, 16, 247, 0.04)",
      "sidebar_border": "rgba(29, 60, 223, 0.04)",
      "sidebar_highlight": "rgba(13, 19, 230, 0.04)",
      "sidebar": "rgb(18, 60, 240)",
      "tab_selected": "rgba(59, 85, 219, 0.04)",
      "toolbar_field_border_focus": "rgba(51, 5, 246, 0.97)",
      "toolbar_field_border": "rgb(16, 2, 170)",
      "toolbar_field_focus": "rgba(7, 5, 34, 0.92)",
      "toolbar_field_highlight_text": "rgba(42, 74, 238, 0.04)",
      "toolbar_field_highlight": "rgba(219, 217, 242, 0.22)",
      "toolbar_field_separator": "rgb(232, 30, 59)",
      "toolbar_field_text_focus": "rgba(191, 199, 246, 0.97)",
      "toolbar_top_separator": "rgba(201, 18, 45, 0.17)",
      "tab_loading": "rgb(6, 51, 246)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3a2ce871-a374-4df2-9136-8336b94690fe}"
    }
  }
}