Examine source code of Silver McFly

{
  "theme": {
    "images": {
      "theme_frame": "firefox_persona_mcfly1.jpg"
    },
    "colors": {
      "frame": "#e129f2",
      "tab_background_text": "#f781ef"
    }
  },
  "version": "2.0",
  "name": "Silver McFly",
  "manifest_version": 2,
  "description": "Silver McFly with black background"
}