Examine source code of hide_border

{
  "theme": {
    "images": {
      "theme_frame": "hide_border.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#c911f2"
    }
  },
  "version": "2.0",
  "name": "hide_border",
  "manifest_version": 2
}