Hi, There's a few possible reasons for that. <br> 1) about:config still has the pref to an old version 2) You have a user.js file active on Firefox. Just to be sure, visit the below page and tell me what it says for the label *https://jeffersonscher.com/res/jstest.php (credit goes to [https://support.mozilla.org/en-US/user/204 jscher2000]) ---- <b><u>Suggestion 1</u></b><br> Follow these steps to see if your user agent is messed up. # Navigate to <code>about:config</code> via Address Bar # Click the button that says, <code>"I'll be careful, I promse!"</code> # At the top of this page, search for <code>general.useragent</code> # Try to reset the following if they exist (If general.useragent prefs are bold (user set) then you can right-click that pref and choose Reset.): *<i> general.useragent.extra.firefox *general.useragent.extra.productName - where productName can be the name of some third party software (e.g. microsoftdotnet), *general.useragent.locale *general.useragent.override *general.useragent.security</i> ---- <b><u>Suggestion 2</u></b><br> You can delete a possible user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release. You can get to the profile folder below: *Help > Troubleshooting Information > Profile Directory > Show Folder or *Go to '''about:support''' and click Show Folder next to Profile Directory.