My website CSS is interpreted differently (in Firefox only) after v.47

Hello, can someone help me understand what could be the cause of most of my text pages appear in white on a white background. We have made no changes to the code or the CSS Web site. Happened since Firefox v.47 came out the previous year. The text of the Web site is fine in all other browsers (IE, Chrome, Edge)

URL for replication:



At line 121 of this file:


You have:


Traditionally, black is indicated using either:


Before 49 Firefox, Firefox would be ignored as an illegal value four-digit value. From Firefox 49, it interprets the fourth digit as the "alpha" or "opacity" of the color indicated by the first three digits. Therefore, #0000 is equivalent to black to an opacity of 0% (completely transparent).

I suggest to change to #000 rather than trying to understand the rules of different browsers on this...

Tags: Firefox

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