Examine source code of Just Some Bubbles

{
  "theme": {
    "images": {
      "theme_frame": "header.PNG"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Just Some Bubbles",
  "manifest_version": 2,
  "description": "Just an abstract image spawned from my imagination. I figured I would make my own header because I couldn't find one I liked."
}