Examine source code of FOE Sniffer

{
  "applications": {
    "gecko": {
      "id": "{f2ae370f-95b4-4cd8-b417-dab5e3bd7148}",
      "strict_min_version": "57.0"
    }
  },
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "name": "FOE Sniffer",
  "version": "1.1.5",
  "homepage_url": "http://freddyp2.free.fr/",
  "icons": {
    "48": "images/icon_FOE.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.forgeofempires.com/game/index*"
      ],
      "js": [
        "foe_content.js"
      ],
      "all_frames": true
    }
  ],
  "options_ui": {
    "browser_style": true,
    "page": "settings/options.html"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://*.forgeofempires.com/*",
    "*://*.innogamescdn.com/*"
  ],
  "web_accessible_resources": [
    "images/*.gif",
    "images/*.png",
    "images/*.css",
    "settings/*.css",
    "settings/*.html",
    "settings/*.js",
    "scripts/*.js"
  ],
  "background": {
    "scripts": [
      "foe_background.js"
    ]
  },
  "default_locale": "en"
}