Examine source code of CircleBlur

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Head_CircleBlur.jpg"
    },
    "colors": {
      "frame": "#1073a8",
      "tab_background_text": "#c3ddf0"
    }
  },
  "version": "2.0",
  "name": "CircleBlur",
  "manifest_version": 2
}