https://www.icyphoenix.com/viewtopic.php?f=35&t=6690&p=46234#p46234
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Lopalong
Sat 28 Nov, 2009 21:43

Re: [bugs] Css -moz-opacity - - Album_allpics.php
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Apparently it's only been an alias for opacity for quite some time  :shock: 

[quote]•History
Prior to Mozilla 1.7 (Firefox 0.9) the -moz-opacity property was implemented in a non-standard (inherited) way. With Firefox 0.9 the behavior changed and the property was renamed to opacity. Since then -moz-opacity was supported just as an alias for opacity.
•Gecko 1.9.1/ Firefox 3.5 and later do not support -moz-opacity.  By now, you should be using simply opacity.[/quote]

[b]More:[/b] https://developer.mozilla.org/en/CSS/opacity


