Examine source code of As Witches Fly

{
  "name": "As Witches Fly",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "AsWitchesFlyH-Copy.jpg"
    },
    "colors": {
      "frame": "rgba(204, 203, 202, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(204, 203, 202, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(204, 203, 202, 0.08)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3e0cd2a-ba75-4a3c-9189-88376a707544}"
    }
  }
}