Examine source code of warning biohazard

{
  "theme": {
    "images": {
      "theme_frame": "biohazardhead.jpg"
    },
    "colors": {
      "frame": "#faf0f0",
      "tab_background_text": "#f2e9e9"
    }
  },
  "version": "2.0",
  "name": "warning biohazard",
  "manifest_version": 2,
  "description": "cool green biohazard symbol random pattern"
}