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TypeError: CSS2Properties doesn't have an indexed property setter for '0' 

Beware of this nasty pitfall if you use Radium

Last Friday it came to my attention that our shop grid on luxglove.com didn't work on Firefox.

When opening the developer tools, I could see this error:

TypeError: CSS2Properties doesn't have an indexed property setter for '0'

And after a few seconds another error would show up ...