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Bug Demo for Mozilla rv:1.6b (Gecko/20031208)
Bugzilla Bug 228399

The four positoned div containers above have their background-color set to #cf33cf (magenta) and their -moz-opacity values set to 1.0, 0.8, 0.6 and 0.4 from left to right, respectively.  For Mozilla rv:1.6a or earlier, the opacity decreases (transparency increases) without a change in the color (hue) of the element's background.  However, rv:1.6b has a serious bug such that the decreasing opacity changes the color (hue), primarily by trashing the red component of the rgb value for background-color.

Compare the handling of this document with Mozilla rv:1.6b versus earlier Mozilla releases.