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That's because ESR is a very ancient version of Firefox. Many things don't work on ESR. You need at least Firefox 52.

• Animats 9y ago
  You need at least Firefox 52. The current release of Firefox is only 53.0.2. If you need 52 to view a site, you're overdoing the new features.
• pjmlp 9y ago
  Enterprises, those companies that you want to eventually adopt Rust, usually use ESR.