Examine source code of Session Hijack Guard

{
  "manifest_version": 2,
  "name": "Session Hijack Guard",
  "short_name": "SHGuard",
  "version": "1.0.0",
  "description": "Detect insecure cookies & suspicious session activity; one-click purge for the current site. All analysis is local only.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Session Hijack Guard"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "cookies",
    "storage",
    "tabs",
    "activeTab",
    "<all_urls>",
    "webRequest"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "session-hijack-guard@0xgz.com",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}