hello

john,

follow the instruction:

An update to Firefox was just released which can cause the problem. This is from the Firefox 77 release notes:

Users with Avast or AVG security software using the HTTPS Scanning feature may get an error message (SSL_ERROR_RX_RECORD_TOO_LONG) when trying to access secure sites. Workarounds are available from this support article until fixed versions of Avast and AVG are available.

The support article link goes to a section of the Secure connection failed and Firefox did not connect article, which explains how to turn off HTTPS scanning in the Web Shield component of Avast/AVG. For more information, see Managing HTTPS scanning in Web Shield in Avast Antivirus on the Avast support site.

I hope resolve your problem then reply back to me .

Thank you

Hello...

If the problem is with a sync account,

Resetting the sync password, or changing its e-mail, will remove all data from the servers.

This is a security feature. https://support.mozilla.org/en-US/kb/ive-lost-my-firefox-sync-account-inf...

   I've lost my Firefox Sync account information - What to do
   I’ve forgotten, or don't have access to, my Firefox Account email address

If the problem is with a sync account,

Resetting the sync password, or changing its e-mail, will remove all data from the servers.

This is a security feature. https://support.mozilla.org/en-US/kb/ive-lost-my-firefox-sync-account-information

   I've lost my Firefox Sync account information - What to do
   I’ve forgotten, or don't have access to, my Firefox Account email address