-moz-background-origin is flagged as unsupported in File->Check Page->Browser Compatibility
This syntax remains valid for Firefox 1.0-3.6. The replacement syntax to be used in Firefox 4.0 forward must be placed after the original command for backward compatibility. Also, it uses a different syntax for its options.
Check out https://developer.mozilla.org/en/CSS/background-origin for the details about the differences in syntax.
Text ID: INDIGO1
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