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PDF Viewer support for PDF Highlight annotations

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Hello. The built-in PDF viewer installed with Firefox 19 does not appear to support PDF Highlight annotations. Is there a time frame for implementing this annotation type? Thanks.

Hello. The built-in PDF viewer installed with Firefox 19 does not appear to support PDF Highlight annotations. Is there a time frame for implementing this annotation type? Thanks.

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I quickly looked at the list of hundreds of open issues for the PDF viewer project, but couldn't figure out what was happening with highlight annotations.