Examine source code of purple flower background

{
  "name": "cherry blossoms yay",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "background 4.png"
    },
    "colors": {
      "frame": "rgba(45, 10, 48, 1)",
      "tab_background_text": "rgba(255, 255, 255, 0.91)",
      "toolbar": "rgba(0, 0, 0, 0.72)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(28, 28, 28, 0.75)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.66)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{41b24daf-1952-4029-bbf7-60a77a0587f9}"
    }
  }
}