Examine source code of trknewstyle

{
  "name": "trknewstyle",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Title2.png"
    },
    "colors": {
      "frame": "rgba(33, 171, 99, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgba(133, 131, 131, 1)",
      "tab_line": "rgba(0, 255, 119, 0.8)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6fce74bb-182c-4af7-8dbd-3b5d161d4065}"
    }
  }
}