There have been several instances of Adobe Flash crashes whether I am using Firefox, IE or Google Chrome browsers - and simply reloading the page corrects this BUT recurs again and again. I'm running Windows 8.1 64bit in which the Flash program apparently comes embedded in the OS as a 32/64 bit hybrid. When I inspect the Flash version add-on in Firefox, and run an update check, Adobe reports, correctly, that my system is Windows 64bit , English, Firefox. Then, when I do the same in Windows Internet Explorer by checking the embedded version, I get a message that KB2999249 is available for download to correct Flash issues in IE. Since that install, Flash hasn't crashed in IE [yet]. So, my question is: How can I be certain that when Firefox reports that Flash is "up-to-date" that it is indeed a 64bit compatible version? Note that the Adobe download site only identifies one available version for Firefox, IE and Google - the current version being 15.0.0.152 file: NPSWF32_15_0_0_152. Does the "32" part of the file name suggest that it is a 32bit application and, if so, where can I find NPSWF64_15_o_o_152 [if it exists]? ''edited the title of this thread to reflect the questions asked''