Firefox, for all its great functionality and superior performance, has long been a laggard when it comes to managing PDF content on the Web.
Apple's Safari and Microsoft's Internet Explorer browsers both give users the option of reading Portable Document Format content within the browser, while Firefox forces users to navigate to PDFs through its Downloads window. Not very convenient.
Leave it to Firefox's online community, however, to remedy this failing. While there are a range of Firefox plug-ins to help manage PDFs documents, two stand out for me.