Examine source code of Inspect HTTP request headers

{
  "author": "Venu Madhav",
  "background": {
    "scripts": [
      "/src/js/httpTrackerConstants.js",
      "/src/js/httpTrackerUtils.js",
      "/src/js/httpTrackerOpen.js"
    ]
  },
  "description": "Inspect HTTP request headers, cookies, data, response Headers, cookies and add/modify request headers before sending requests",
  "manifest_version": 2,
  "name": "HTTP-TRACKER",
  "permissions": [
    "storage",
    "webRequest",
    "<all_urls>",
    "webRequestBlocking",
    "tabs",
    "cookies"
  ],
  "version": "2.2.6",
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "/src/assets/icon_320px.png",
      "32": "/src/assets/icon_320px.png"
    },
    "default_title": "HTTP-TRACKER : Inspect HTTP request headers, cookies, data, response Headers, cookies and add/modify request headers before sending requests"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+1"
      },
      "description": "Open HTTP-TRACKER if not opened, or bring to front if already opened"
    }
  },
  "options_ui": {
    "page": "/src/html/options.html",
    "open_in_tab": true
  },
  "icons": {
    "320": "/src/assets/icon_320px.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{6b4a4cff-cd61-4e36-afd2-fdf9ce1e49f6}"
    }
  }
}