Examine source code of SEGA GENESIS

{
  "manifest_version": 2,
  "version": "7",
  "name": "gnesis-update",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(80, 80, 80, 0.49)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(84, 90, 94)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(53, 76, 81, 0.65)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 251, 251, 0.37)",
      "popup": "rgb(53, 76, 81)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(0, 0, 0, 0.43)",
      "button_background_hover": "rgba(255, 255, 255, 0.24)",
      "icons_attention": "rgb(0, 255, 158)",
      "icons": "rgb(255, 255, 255)",
      "popup_border": "rgba(255, 251, 251, 0.37)",
      "popup_highlight": "rgb(34, 25, 77)",
      "sidebar_highlight_text": "rgba(249, 249, 249, 0.79)",
      "sidebar_highlight": "rgba(85, 109, 109, 0.79)",
      "tab_selected": "rgba(53, 76, 81, 0.41)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(120, 120, 120, 0.59)",
      "toolbar_field_border_focus": "rgba(255, 255, 255, 0.16)",
      "toolbar_field_border": "rgb(0, 0, 0)",
      "toolbar_field_focus": "rgba(80, 80, 80, 0.73)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgba(29, 113, 127, 0.81)",
      "toolbar_top_separator": "rgba(120, 120, 120, 0.59)",
      "tab_loading": "rgba(255, 251, 251, 0.37)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{382f1c66-22c5-4e4e-a80b-12526fda96d5}"
    }
  }
}