Examine source code of Saved by the tab

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Saved by the tab",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-024-8de86d890779309c9a66423c64daa480.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(147, 118, 224)",
      "toolbar_text": "rgb(246, 255, 166)",
      "frame": "rgb(232, 147, 207)",
      "tab_background_text": "rgb(113, 87, 184)",
      "toolbar_field": "rgb(113, 87, 184)",
      "toolbar_field_text": "rgb(246, 255, 166)",
      "tab_line": "rgba(223, 85, 71, 0)",
      "popup": "rgb(246, 255, 166)",
      "popup_text": "rgb(113, 87, 184)",
      "button_background_active": "rgb(232, 147, 207)",
      "button_background_hover": "rgb(113, 87, 184)",
      "frame_inactive": "rgba(232, 147, 207, 0.9)",
      "icons_attention": "rgb(232, 147, 207)",
      "icons": "rgb(246, 255, 166)",
      "ntp_background": "rgb(232, 147, 207)",
      "ntp_text": "rgb(113, 87, 184)",
      "popup_border": "rgba(223, 85, 71, 0)",
      "popup_highlight_text": "rgb(113, 87, 184)",
      "popup_highlight": "rgb(147, 118, 224)",
      "sidebar_border": "rgba(252, 231, 222, 0)",
      "sidebar_highlight_text": "rgb(246, 255, 166)",
      "sidebar_highlight": "rgb(113, 87, 184)",
      "sidebar_text": "rgb(113, 87, 184)",
      "sidebar": "rgb(232, 147, 207)",
      "tab_background_separator": "rgba(113, 87, 184, 0)",
      "tab_loading": "rgba(113, 87, 184, 0)",
      "tab_selected": "rgb(147, 118, 224)",
      "tab_text": "rgb(246, 255, 166)",
      "toolbar_bottom_separator": "rgb(147, 118, 224)",
      "toolbar_field_border_focus": "rgba(223, 85, 71, 0)",
      "toolbar_field_border": "rgba(34, 25, 77, 0)",
      "toolbar_field_focus": "rgb(113, 87, 184)",
      "toolbar_field_highlight_text": "rgb(113, 87, 184)",
      "toolbar_field_highlight": "rgb(246, 255, 166)",
      "toolbar_field_separator": "rgba(34, 25, 77, 0)",
      "toolbar_field_text_focus": "rgb(246, 255, 166)",
      "toolbar_top_separator": "rgba(34, 25, 77, 0)",
      "toolbar_vertical_separator": "rgba(77, 25, 34, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2210156d-97bf-4f03-9f0a-2d6d9ff6e78c}"
    }
  }
}