Hey katia.ru199898, Help for you problem mb there > - https://support.mozilla.org/ru/kb/firefox-zavisaet-ili-ne-reagiruet - According to Mozilla, Firefox has an audience of 225 million active users, so it is of interest to developers. The organization has recently reduced part of its staff and is afraid of negative side effects due to antitrust proceedings against Google in the United States Https only mode». - The main improvement of Firefox 83 was the "HTTPS Only" mode. In this mode, the browser tries to establish fully secure connections with each website (similar to HTTPS Everywhere). If this fails, Firefox requests permission to connect to a site that does not support secure connections. To enable HTTPS-Only mode, go to Firefox menu > Settings > Privacy and security (about:preferences#privacy), scroll to the " HTTPS-Only "section And select Enable HTTPS-Only mode in all Windows. -Enable "HTTPS Only" mode in all Windows - HTTPS is a more secure version of the HTTP Internet Protocol used to connect users to websites. Secure connections are a necessary measure to reduce the risk of introducing third-party content, i.e. data modification and man-in-the-middle attacks. Passwords, credit card numbers, and other confidential information will be kept safe from third parties. In addition, users can be sure that they are interacting with the correct site. Although most sites support HTTPS, some web resources revert to using the insecure and outdated HTTP Protocol. In addition, there are millions of outdated HTTP links published on the Internet that point to unsafe versions of websites. «Https only mode» - Mozilla is trying to push users to always use HTTPS. The "HTTPS Only" mode ensures that Firefox will not establish insecure connections without the user's permission. Whether you click on an HTTP link or manually enter the HTTP address, Firefox will use HTTPS in this mode. In the near future, the "HTTPS Only" mode may be enabled in Firefox by default. The main obstacle preventing Mozilla from doing this right now is that some HTTPS websites still upload images, videos, and other content over HTTP. As a result, they may not be displayed correctly in the "HTTPS Only"mode. Users can disable the "HTTPS Only" mode for a specific site by clicking the icon in the address bar. With best regards, Henry.M