Examine source code of DeepDevilDivers

{
  "theme": {
    "images": {
      "theme_frame": "Firefoxheader.jpg"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#ffff00"
    }
  },
  "version": "2.0",
  "name": "DeepDevilDivers",
  "manifest_version": 2,
  "description": "DEEP DEVIL DIVERS\nExtrem Diving Association\nRebreather diving \nFrance"
}