Examine source code of Gently Falling

{
  "name": "Gently Falling",
  "manifest_version": 2,
  "version": "6.0",
  "theme": {
    "images": {
      "theme_frame": "GentlyFallingH.jpg"
    },
    "colors": {
      "frame": "rgba(237, 206, 185, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(237, 207, 185, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(237, 207, 185, 0.07)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(3, 3, 3, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8860cd0f-b93c-4192-9186-f49875698d1d}"
    }
  }
}