Use PDF Download to do whatever you like with PDF files on the Web and regain control. Web to PDF–Convert any Web pages to high-quality PDF files while retaining page layout, images, text and hyperlinks, and then save, share, print or archive them. View PDF as HTML–View the contents of PDF files faster and eliminate browser problems by instantly converting any Web-based PDF to a browser-friendly HTML Web page. Control PDF files–Stop crashes and get the upper hand on Web-based PDF files by automating and controlling how your browser deals with them.
PDF Download is in the Firefox Add-ons & Plug-ins category of the Browsers section.