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Thanks, we're looking into how to fix the perf in FF. Meanwhile, it works on my tiny mobile cell phone.

Disabling the box shadow on .content-root fixes the performance bug (FF46.0).

We just discovered the same by disabling the media query which handles the shadow. Thank you very much for investigating.

Seems to work fine on FF (46) now, thanks.

Thanks for finding that out. We (Firefox) fixed a box shadow performance bug [1] in Firefox 47, which will be released on June 7th. It looks like this site is hitting that perf bug.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1250947

I can confirm the same laggy behavior in FF 46. But, strangely, it works completely fine on FF 48 (dev edition) :S

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