Examine source code of Face to Face

{
  "theme": {
    "images": {
      "theme_frame": "firefox_template.jpg"
    },
    "colors": {
      "frame": "#1c2094",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Face to Face",
  "manifest_version": 2,
  "description": "Just simple two lovers looking at each other...."
}