the concerns using 3rd party for saving your login credential is kinda risky. since a possible leak may occur at may mga service provider na nagkaroon na ng ganung sitwasyon

for me I just use Firefox sync

The authentication key is transmitted to the server to prove that you own the account. If TLS fails, this might cause the authentication key to be leaked, and someone who intercepts this key could use it to authenticate into your account. However, they can’t use it to access your Firefox Sync data since the encryption key is used to encrypt your data before it leaves your device. This key is never transmitted to the server, so it can’t be leaked if TLS fails.