 With the annotation tools, this allows collaboration to take place on a single PDF, rather than on multiple versions shared between parties.The Firefox extension renders PDFs using PDFVue's servers, thus avoiding the Acrobat Plug-In freeze-up, as well as Acrobat Reader exploits.When enabled, this extensions traps URL requests on a low level catching PDFs from clicks, redirects, new tabs and the address bar, providing a better level of protection from an unintended PDF launch.