Examine source code of shiv

{
  "name": "shiv",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1f0b10eb5d4764e014130108d517c55c.jpg"
    },
    "colors": {
      "frame": "rgba(13, 77, 227, 1)",
      "tab_background_text": "rgba(240, 12, 12, 1)",
      "toolbar": "rgba(22, 33, 240, 0.57)",
      "bookmark_text": "rgba(214, 201, 201, 1)",
      "toolbar_field": "rgba(194, 183, 183, 1)",
      "toolbar_field_text": "rgba(173, 102, 102, 1)",
      "tab_line": "rgba(158, 152, 152, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{eff31193-d266-45f3-8046-db78ba7d1e1f}"
    }
  }
}