Firefox users, the wait is finally over. Now you can read PDFs in the browser without needing a plugin. Firefox 19 also adds startup performance improvements, new features for developers and the usual bug fixes.
The built-in PDF viewer is the most noteworthy change. You can work with PDFs opened in Firefox's tabs like you can with other PDF apps (and in Chrome): change the size view, search within the document, see page thumbnails, print and save to disk. You can also bookmark the PDF in Firefox.
The update is available now for Windows, Mac and Linux. See the whole changelog or download Firefox 19 from the link below.
Firefox 19 Release Notes [Mozilla]