Examine source code of HTTP Manager

{
  "name": "HTTP Manager",
  "description": "__MSG_appdesc__",
  "version": "1.2resigned1",
  "default_locale": "en",
  "icons": {
    "16": "img/16.png",
    "32": "img/32.png",
    "48": "img/48.png",
    "64": "img/64.png",
    "128": "img/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "img/16.png",
    "default_title": "HTTP Manager FireFox Extension"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{e94fe217-428e-49fa-9825-7545266c0595}",
      "strict_min_version": "57.0"
    }
  }
}