Examine source code of BK1

{
  "name": "BK1",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "gitbanner.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 221, 0, 1)",
      "toolbar": "rgba(84, 84, 84, 1)",
      "bookmark_text": "rgba(255, 221, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(255, 221, 0, 1)",
      "tab_line": "rgba(255, 221, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{47412862-805c-4869-a004-6d98965df843}"
    }
  }
}