Diễn đàn hỗ trợ Firefox

I was logged into a website which hanged and when I tried to log back on it started giving me the error PR_END_OF_FILE_ERROR .I've tried to troubleshoot with all the help I could get on these pages and others, I'm at my wits end. The website works on my phone browser, so it's clearly this laptop or my internet dongle.

It's also happening across all browsers. I don't have VPN or antivirus software on except Microsoft Essentials. I've tried removing real time protection on that but it didn't work. I tried creating a new profile of Firefox, nothing. I tried going to about:config page and setting security.ssl.enable_ocsp_stapling to false, nothing so set it back to true I've gone to task manager to see whether there is a task don't recognise so I can stop it, nothing. Pleeeease heeeelp meeeeee!

I created my Firefox account with an old email address that is no longer accessible and will never be accessible again. I added a secondary email address long ago and made it primary. My account is logged in on my phone and my old laptop, both need repair, laptop data is probably gone. I logged in on my new laptop and a tablet, but had to change the password. Now Firefox does not know my logins and passwords, history, settings and preferences, bookmarks. It seems as if I have created a new account. How can I regain access to my old data?

Its 2020 man!

Why are we (Mozilla community) still missing content casting feature just like Google Chrome and other browsers. Even the new Microsoft Edge Chromium have that feature. I usually stream a lot of content and this feature, for me, is indispensable.

Furthermore, I am not asking for any workaround or extensions. There should be a native casting feature on Mozilla Firefox too just like other browsers.

Regards, VIVEK