Examine source code of firstred

{
  "theme": {
    "images": {
      "theme_frame": "headerimage.jpg"
    },
    "colors": {
      "frame": "#fa0f0f",
      "tab_background_text": "#f50303"
    }
  },
  "version": "2.0",
  "name": "firstred",
  "manifest_version": 2
}