fix: Firefox has the older version of ResizeObserver without the arrays of size values for column layouts, so LUME was broken in Firefox. Adds a fallback to the non-array contentBoxSize value.
fix: Firefox has the older version of ResizeObserver without the arrays of size values for column layouts, so LUME was broken in Firefox. Adds a fallback to the non-array contentBoxSize value.

trusktr/infamous,trusktr/infamous,trusktr/infamous