Instead, I got this:
Basically, Firefox complains that Reddit has a certificate for firstmedia.com
firstmedia.com is my ISP. In Indonesia, ISP is required to block bad sites and Reddit is one of the site blocked.
They do so by poisoning DNS or something. By changing the DNS I usually can access Reddit.
However, for some reason, firefox still thinks that Reddit uses firsmedia.com's certificate.
And what should I do to be able to open Reddit in Firefox?