Examine source code of Web Content Downloader

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "1.0",
  "description": "__MSG_extDesc__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "web-content-downloader@example.com",
      "strict_min_version": "79.0"
    }
  },
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "<all_urls>",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "__MSG_extName__"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "jszip.min.js"
  ],
  "content_security_policy": "script-src 'self'; object-src 'none'"
}