Examine source code of Tangerine-2

{
  "name": "Tangerine-1",
  "manifest_version": 2,
  "version": "6.0",
  "theme": {
    "images": {
      "theme_frame": "Annotation 2020-04-13 124509.png"
    },
    "colors": {
      "frame": "rgba(244, 120, 8, 1)",
      "tab_background_text": "rgba(250, 250, 250, 1)",
      "toolbar": "rgba(168, 136, 89, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(237, 228, 228, 1)",
      "toolbar_field_text": "rgba(20, 1, 1, 1)"
    }
  }
}