Examine source code of aube---

{
  "theme": {
    "images": {
      "theme_frame": "aube.jpg"
    },
    "colors": {
      "frame": "#798aa8",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "aube---",
  "manifest_version": 2,
  "description": "aube dawn paysage landscape"
}