To view what your user agent string currently is, you can use the Troubleshooting Information page. Either: * "3-bar" menu button > "?" button > Troubleshooting Information * (menu bar) Help > Troubleshooting Information * type or paste '''about:support''' in the address bar and press Enter It's in the first table on the page. Some add-ons may modify your user agent string as seen by sites. I have a test page where you can see what was reported (it's normal to appear in red text): https://www.jeffersonscher.com/res/jstest.php ---- Also, your Firefox identified itself to the forum as version 42. An update is available: this article describes how to get Firefox 48.0 using the "About Firefox" dialog on the help menu: [[Update Firefox to the latest version]]. If something is holding you back from upgrading to Firefox 48, please let us know so we can suggest solutions or workarounds. Version 42 is not secure; Mozilla discloses [https://www.mozilla.org/security/known-vulnerabilities/firefox.html security flaws] after each new release.