I do not use ffox but it looks like your fox looks for plugins here'
but it does not have the other plugin.
I am guessing media windows means you have a windows version of firefox and its plugin?
2) if so, you are unlikely to succeed with a copy of windows flashplayer.xpt being put into /usr/lib/mozilla/plugins/
3) try it if you like but you may be better off going for a new install...
I am suggesting that you d/load the tar.gz as you get more control.....you can copy the extracted named 2 files to each browser plugin folder....in case you run more than one browser....and try /usr/lib/mozilla/plugins/ first.
4) In opera preferences you can see the plugins pathway....hopefully ffox has a similar option....but there is no harm sticking those 2 files in each linux plugin folder you can find....but make a backup of the current linux ones and keep them in /home/name/download for now until you know you have success