Examine source code of Denver Broncos (NFL)

{
  "name": "Denver Broncos (NFL)",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Variant=Default.svg"
    },
    "colors": {
      "frame": "rgba(10, 35, 67, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(3, 23, 50, 0.7)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(3, 23, 50, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(252, 76, 2, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{766034e4-4b9f-4363-8808-5b264ce379e2}"
    }
  }
}