Adobe Acrobat PDF Extension is described as 'Do more than just view your PDF files online. With the Acrobat extension, you can mark up proposals, leave sticky note comments, and use your favorite PDF tools without leaving your browser' and is a PDF Reader in the office & productivity category. There are 2 alternatives to Adobe Acrobat PDF Extension for a variety of platforms, including Google Chrome, Opera, Mozilla Firefox, Mac and Windows apps. The best Adobe Acrobat PDF Extension alternative is Firefox PDF Viewer (PDF.js), which is both free and Open Source.
PDF Viewer (aka pdf.js) is a new revolutionary extension using web standard technologies that allows you to display within Mozilla Firefox almost all PDF files found on the web without a plugin.
In version 8, Google Chrome introduced a free PDF viewer, installed by default. While this plug-in lacks many features of the Adobe Acrobat Plug-in, it is much faster and lighter, and updates with the browser rather than an external utility.
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