Examine source code of Easter Banner

{
  "name": "Easter Banner",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "EasterBannerH.jpg"
    },
    "colors": {
      "frame": "rgba(223, 225, 237, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(223, 225, 237, 0.09)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{df496c25-cc02-4d7f-a4b2-0fcfdef35db5}"
    }
  }
}