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Doesn't work for me either (though not latest because of extension fiasco) Windows 64-bit. Maybe an extension? All I've got is ublock origin.

Works fine in Firefox ESR on Debian.

Also works in latest on Windows 64-bit

Doesn't work on Chrome 56 either (Work enforced old version, sadly)

works fine for me (macos)

Interesting; after further testing it works fine in Firefox on MacOS but not Firefox on Ubuntu.