Examine source code of Promise of Spring

{
  "name": "Promise of  Spring",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(101, 8, 163, 1)",
      "toolbar": "rgba(255, 229, 229, 0)",
      "bookmark_text": "rgba(101, 8, 163, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.04)",
      "toolbar_field_text": "rgba(101, 8, 163, 1)",
      "tab_line": "rgba(101, 8, 163, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9b7f8a1b-5a26-4181-9bcd-b99fc945e868}"
    }
  }
}