Examine source code of Chemistry is Cool

{
  "theme": {
    "images": {
      "theme_frame": "chemistry.png"
    },
    "colors": {
      "frame": "#161fc9",
      "tab_background_text": "#bac"
    }
  },
  "version": "2.0",
  "name": "Chemistry is Cool",
  "manifest_version": 2,
  "description": "Chemistry images"
}