Examine source code of HTTP request maker

{
  "manifest_version": 2,
  "name": "HTTP request Maker",
  "description": "Displays a sidebar that lets you to forge HTTP requests",
  "version": "1.3",
  "applications": {
    "gecko": {
      "strict_min_version": "54.0a1"
    }
  },
  "sidebar_action": {
    "default_icon": "icons/icon_final64.png",
    "default_title": "HTTP request Maker",
    "default_panel": "sidebar/panel.html"
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://*/*",
    "<all_urls>",
    "tabs"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Alt+Shift+Y"
      }
    }
  }
}