Examine source code of Abyss v2

{
  "name": "Abyss",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Abyss.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(189, 189, 189, 1)",
      "toolbar": "rgba(102, 55, 55, 0)",
      "bookmark_text": "rgba(189, 189, 189, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(189, 189, 189, 1)",
      "tab_line": "rgba(189, 189, 189, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3d025c73-68bc-444f-8a87-136822b8cb40}"
    }
  }
}