diff --git a/etc/firefox/policies/policies.json b/etc/firefox/policies/policies.json
index 58f4c09e..39b18cb6 100644
--- a/etc/firefox/policies/policies.json
+++ b/etc/firefox/policies/policies.json
@@ -193,6 +193,10 @@
       "{759dbb01-b646-4327-bf9e-69ca2543ef8d}": {
         "install_url": "https://addons.mozilla.org/firefox/downloads/latest/opendyslexic-for-firefox/latest.xpi",
         "installation_mode": "normal_installed"
+      },
+      "{a6c4a591-f1b2-4f03-b3ff-767e5bedf4e7}": {
+        "install_url": "https://addons.mozilla.org/firefox/downloads/latest/user-agent-string-switcher/latest.xpi",
+        "installation_mode": "normal_installed"
       }
     },
     "FirefoxHome": {