Examine source code of YouTheater

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "YouTheater",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(41, 41, 41)",
      "toolbar_text": "rgb(235, 217, 176)",
      "frame": "rgb(50, 50, 50)",
      "tab_background_text": "rgb(126, 121, 115)",
      "toolbar_field": "rgb(66, 66, 66)",
      "toolbar_field_text": "rgb(164, 164, 164)",
      "tab_line": "rgb(128, 123, 85)",
      "popup": "rgb(249, 249, 251)",
      "popup_text": "rgb(21, 20, 26)",
      "button_background_active": "rgb(62, 62, 62)",
      "button_background_hover": "rgb(64, 59, 51)",
      "icons_attention": "rgb(255, 255, 255)",
      "icons": "rgb(204, 190, 163)",
      "popup_border": "rgb(207, 207, 216)",
      "popup_highlight_text": "rgb(21, 20, 26)",
      "popup_highlight": "rgb(224, 224, 230)",
      "sidebar_border": "rgb(207, 207, 216)",
      "sidebar_highlight_text": "rgb(21, 20, 26)",
      "sidebar_highlight": "rgb(224, 224, 230)",
      "sidebar_text": "rgb(21, 20, 26)",
      "sidebar": "rgb(249, 249, 251)",
      "tab_loading": "rgba(255, 255, 255, 0.22)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(36, 36, 36)",
      "toolbar_field_border": "rgb(128, 113, 85)",
      "toolbar_field_focus": "rgb(48, 48, 48)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(124, 124, 124)",
      "toolbar_field_text_focus": "rgb(199, 199, 199)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb1dfd7c-f207-4cb8-a967-cb4e2bd8dc07}"
    }
  }
}