Your connection is not secure
The website tried to negotiate an inadequate level of security.
http://www.google.com uses security technology that is outdated and vulnerable to attack. An attacker could easily reveal information which you thought to be safe. The website administrator will need to fix the server first before you can visit the site.
Error code: NS_ERROR_NET_INADEQUATE_SECURITY
Pesan diatas yang muncul pasca Update Firefox Quantum 57.0.4. Googling punya googling solusinya ternyata simple:
- Buka config firefox dengan menuliskan `about:config` di urlbar firefox
- Masukkan kata kunci `http2`. Klik 2 kali untuk merubah dari true menjadi false
- Selesai, selamat browsing 😉
Just an ordinary people :)
Ga Penting Banget...ga usah di baca :) 
Thanks a lot