Examine source code of rainbow12

{
  "theme": {
    "images": {
      "theme_frame": "rainbow_eyes_by_unidantoekana.jpg"
    },
    "colors": {
      "frame": "#2a3fc7",
      "tab_background_text": "#e33be0"
    }
  },
  "version": "2.0",
  "name": "rainbow12",
  "manifest_version": 2,
  "description": "the last ......... : /"
}