Examine source code of HTTP Info

{
  "manifest_version": 2,
  "name": "HTTP Info",
  "version": "1.0.4resigned1",
  "description": "Display HTTP request information for the current page",
  "permissions": [
    "<all_urls>",
    "tabs",
    "clipboardWrite",
    "webRequest"
  ],
  "browser_action": {
    "default_icon": "assets/img/icons/default-16.png",
    "default_title": "HTTP Info",
    "browser_style": true,
    "default_popup": "popup/layout.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab2835f7-3882-4e58-98c7-f429283160b0}"
    }
  }
}