I have a computer with Windows 10. For about two to three months from now, every so often, my computer/windows crashes when I open or save a PDF file on Firefox, which is extremely upsetting. I just found out some days ago that Firefox doesn't use anymore the adobe reader plugin, but uses instead its own built-in PDF viewer. When I changed the setting to use the external adobe reader software to open and/or download pdf files, it seems that my computer doesn't crashes anymore. So my questions are: why the bult-in PDF viewer makes windows 10 crash? Will that problem be fixed, and when? and lastly, why does Firefox forces to use its own built-in PDF viewer when it can't function correctly with windows 10? This have been the more upsetting problem I have had with my computer for a long time!