Firefox has detected a potential security threat and requires a secure connection because accounts.firefox.com...
solution:
1. Enter about:config in the Firefox address bar. After opening, set the following 4 Boolean values to false.
security.SSL3. dhe _ DSS _ AES _ 128 _ sha
security.SSL3. dhe _ RSA _ AES _ 128 _ sha
security.SSL3. dhe _ RSA _ AES _ 256 _ sha
security.SSL3. dhe _ RSA _ des _ ede3 _ sha
2. If 1 does not work, continue to set security.enterprise_roots.enabled to true
3. If 2 does not work, please continue to open firefox settings
