Examine source code of Spring Nature Bird Theme

{
  "manifest_version": 2,
  "name": "Spring Bird - Premium",
  "version": "1.0.0",
  "description": "Gentle meadow greens with morning sky blues. Fresh air, new beginnings.",
  "author": "Firefox Premium Themes",
  "theme": {
    "colors": {
      "frame": "#66BB6A",
      "tab_background_text": "#1B5E20",
      "toolbar": "#81C784",
      "toolbar_text": "#1B5E20",
      "toolbar_field": "#A5D6A7",
      "toolbar_field_text": "#2E7D32",
      "toolbar_field_border": "#4CAF50",
      "toolbar_field_focus": "#C8E6C9",
      "tab_line": "#29B6F6",
      "tab_selected": "#C8E6C9",
      "popup": "#81C784",
      "popup_text": "#1B5E20",
      "popup_border": "#66BB6A",
      "sidebar": "#E8F5E9",
      "sidebar_text": "#1B5E20",
      "sidebar_border": "#81C784",
      "button_background_hover": "#A5D6A7",
      "button_background_active": "#C8E6C9"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "spring-bird-premium@firefox-themes.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}