Examine source code of Telegram theme 2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Telegram",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(23, 33, 43)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(23, 33, 43)",
      "tab_background_text": "rgb(118, 140, 158)",
      "toolbar_field": "rgb(36, 47, 61)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(23, 33, 43)",
      "popup_text": "rgba(255, 255, 255, 0.75)",
      "button_background_hover": "rgb(82, 136, 193)",
      "popup_border": "rgba(82, 136, 193, 0)",
      "tab_selected": "rgba(118, 140, 158, 0.35)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6774decd-29bb-4913-b808-2b3a419b1266}"
    }
  }
}