Examine source code of rstar

{
  "name": "rstar",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "th-1054076980.png"
    },
    "colors": {
      "frame": "rgba(0, 153, 153, 0.75)",
      "tab_background_text": "rgba(252, 248, 0, 1)",
      "toolbar": "rgba(219, 215, 215, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(237, 227, 38, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(255, 242, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec3fd147-adcd-4d15-99af-87ecdac4e2ef}"
    }
  }
}