Examine source code of Inverted Fire

{
  "theme": {
    "images": {
      "theme_frame": "header.JPG"
    },
    "colors": {
      "frame": "#2948fc",
      "tab_background_text": "#1f2a38"
    }
  },
  "version": "2.0",
  "name": "Inverted Fire",
  "manifest_version": 2,
  "description": "Fire in the negative on a white background"
}