- OS— Ubuntu 16.04 (64 bit).
- Browser— Firefox 50.0.2.
I've tried clearing my cookies and restarting Firefox. No change. I've tried disabling all my addons and restarting Firefox. No change. I've tried installing regular Ubuntu updates and restarting my entire computer. No change. I've tried opening the affected sites in Opera, and they all work perfectly in that browser.
What is going on? How do I fix this?