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# Firefox 19 launches with in-built PDF viewer

In releasing Firefox 19 yesterday, Mozilla has launched a new in-built PDF viewer that negates the requirement for the Adobe Reader XI plug-in.

In releasing the Firefox 19 browser yesterday, Mozilla has launched a new in-built PDF viewer that negates the requirement for the Adobe Reader XI plug-in.

Many will see this as good news, given recent discoveries about its vulnerability.

The new reader is JavaScript-based and like the browser that supports it, the viewer is open source.

There are a number of smaller changes that come with Firefox 19, including support for several new CSS features, including @page, full-width text transforms and the new viewport percentage units like vh, vw, vmax and vmin that can be used for sizing elements or adjusting type based on viewport size. This will enable Responsive Web Designs to function a little better.

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