Examine source code of Yellow Swirls

{
  "theme": {
    "images": {
      "theme_frame": "ff-header.png"
    },
    "colors": {
      "frame": "#ffff66",
      "tab_background_text": "#996633"
    }
  },
  "version": "2.0",
  "name": "Yellow Swirls",
  "manifest_version": 2,
  "description": "This is a bright, fun theme that you can use when you're in a chipper mood. Enjoy!"
}