Hallo,
Übersehe ich jetzt etwas
Offensichtlich.
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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.
Note: Firefox 3.5 and later do not support -moz-opacity. By now, you should be using simply opacity.
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Grüße
Thomas