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Your site does not works with Firefox ESR.

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

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.

Enterprises, those companies that you want to eventually adopt Rust, usually use ESR.