Now there is no doubt that in Firefox 15 or, at worst, in Firefox 16 (if something goes wrong), we will definitely see it. The Firefox browser should definitely have its own built-in PDF viewer, which the developers have been promising to release for quite some time now. is also working on its integrated PDF reader, called PDF.js, which is included in Firefox 14 (albeit disabled by default).

It shows any PDF document like a normal web page, the only difference is an additional toolbar that appears when you hover over the document. Display in a browser is perhaps the easiest way to read a PDF document without installing a separate application. If you are using then you already have a PDF reader. There are programs that provide features that are not available in Adobe Reader. Some alternative PDF readers are lightweight applications with a minimal set of features designed to easily view PDF files, while others, on the contrary, have a whole host of additional options and features. But Adobe's PDF Reader is no longer the only option, and there are really high-quality free PDF viewers that work on the Windows operating system and beyond. They simply install their familiar Adobe Reader. Most people don't think about PDF readers that can be installed.

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