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"galleria-stage" "left:-10000px"
seems to be part of the issue in Firefox.

Firefox debug console says javascript exceptions were thrown on:
cloudflare-min.js:368
cloudflare-min.js:263
cloudflare-min.js:362
cloudflare-min.js:371
cloudflare-min.js:639
cloudflare-min.js:35
cloudflare-min.js:23
cloudflare-min.js:20
rocket.js:1

Error console now reports:
TypeError: i is undefined
Source File: ajax.cloudflare.com/cdn-cgi/nexp/aav=4114775854/cloudflare.min.js
Line: 36