Download the latest version of the Firefox Flash plugin from the adobe website. Your best option is to right-click the download link and select Save As.
   Extract the contents of the downloaded file to a folder on the local system. You may need to change the file extension to zip if you have only access to the standard Windows unzipper.
   Move the two files NPSWF32.dll (NPSWF64.dll for 64 bit) and flashplayer.xpt into the Firefox plugin directory e.g.: C:\Program Files\Firefox\plugins. The plugin directory is located in the root directory if you are using a portable version of Firefox, if Firefox is installed is is located in the profile folder. Easiest option to find out where the folder is located is to enter about:support in the address bar. This works for Firefox 3.6 and up.
   If no Plugins folder exist create the folder and move the two Flash Player files into the folder.
   Restart Firefox to make this work and visit http://www.adobe.com/software/flash/about/ to check your flash player version number.
   You can now enjoy Flash based contents. Be aware that the plugin is not auto-updating itself. You need to make sure to keep it up to date manually.

I am having issues finding a work around to intall flash on my work laptop. I did some searching and was able to find the work around below. However, there was no plugins folder and when I tried to create one, I was denied creating a new folder. So, I tried find another work around and some said I can go into Run: %APPDATA% and it will bring me to Firefiox extension, plugins, etc. There was no plugin folder, so I created one and saved it into the plugin folder. It looked like it too, but then when I went to restart Firefox, it kept crashing and running slow. I made sure that I was using the correct DLL. Is there another work around? If you are a Firefox user and want to use Flash but do not have administrative privileges do the following: Download the latest version of the Firefox Flash plugin from the adobe website. Your best option is to right-click the download link and select Save As. Extract the contents of the downloaded file to a folder on the local system. You may need to change the file extension to zip if you have only access to the standard Windows unzipper. Move the two files NPSWF32.dll (NPSWF64.dll for 64 bit) and flashplayer.xpt into the Firefox plugin directory e.g.: C:\Program Files\Firefox\plugins. The plugin directory is located in the root directory if you are using a portable version of Firefox, if Firefox is installed is is located in the profile folder. Easiest option to find out where the folder is located is to enter about:support in the address bar. This works for Firefox 3.6 and up. If no Plugins folder exist create the folder and move the two Flash Player files into the folder. Restart Firefox to make this work and visit http://www.adobe.com/software/flash/about/ to check your flash player version number. You can now enjoy Flash based contents. Be aware that the plugin is not auto-updating itself. You need to make sure to keep it up to date manually.