Examine source code of Polarity

{
  "name": "Polarity",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "header-KIO3.gif"
    },
    "colors": {
      "frame": "rgba(64, 1, 128, 1)",
      "tab_background_text": "rgba(233, 233, 23, 1)",
      "toolbar": "rgba(13, 0, 15, 0.45)",
      "bookmark_text": "rgba(255, 233, 255, 1)",
      "toolbar_field": "rgba(3, 3, 3, 0.69)",
      "toolbar_field_text": "rgba(233, 233, 169, 1)",
      "tab_line": "rgba(234, 235, 197, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{970a4ec1-5997-4f22-9bd6-759e318f88da}"
    }
  }
}