Update Useragent to 60ESR because
many websites think it is old browser. Youtube for example doesn't show their contents until I change useragent to 59 or above.
-- our web browser is: Firefox 52 on Windows 7 Is your Web browser up to date? ✗ Your web browser is out of date. Out of date web browsers can have security problems and may cause websites to not work properly. You have version 52.0, why not upgrade to 59.0.2? How to upgrade Firefox