Examine source code of gruveye

{
  "name": "gruveye",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "bar.png"
    },
    "colors": {
      "frame": "rgba(31, 42, 49, 1)",
      "tab_background_text": "rgba(234, 223, 233, 1)",
      "toolbar": "rgba(31, 42, 49, 1)",
      "bookmark_text": "rgba(234, 223, 233, 1)",
      "toolbar_field": "rgba(78, 97, 112, 1)",
      "toolbar_field_text": "rgba(234, 223, 233, 1)",
      "tab_line": "rgba(31, 42, 49, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{649341dd-e041-4086-a696-9057f423a525}"
    }
  }
}