Examine source code of BTS

{
  "name": "BTS",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "iwm9ks1lc-mx83ej-nx-dje3-jdxm-bts-lal-72j-kdi3-2018-bb5-billboard-su7-1500 (2).jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(94, 94, 94, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  }
}