Examine source code of Flow Intercepter

{
  "name": "Flow Intercepter",
  "description": "Download intercepter for Flow",
  "version": "1.0",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "flowcatcher.essmehdi@github.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "links.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "catcher.js"
    ]
  },
  "permissions": [
    "downloads",
    "nativeMessaging",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "cookies",
    "<all_urls>"
  ]
}