clicking add-ons in my portable firefox (installed on a flash drive and on a usb hard drive) shows both version 8 and version 10 (the current) installed, but going to a page with flash content, only version 8 plays. when i disable version 8 in add-ons, leaving version 10 enabled, nothing will play! i tried installing the extension per your plug-in page, but it says it failed because "install script not found".
any help? i do want to be able to see flash content, but am loathe to continue running version 8 (which works fine in ff portable) for security reasons. thanx.
LATER EDIT: in desperation, just copied over the file from my system 32/macromedia/flash directory on my desktop to the portable installation on the usb drive, and voila! then i found a note here saying the instead of clicking that .xpi file, you should rename it to have a .zip extension, unzip it, and use those files, which also works. wonder why they make life so obtuse? 
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We're working on making it easier:
https://portableapps.com/node/15501
Sometimes, the impossible can become possible, if you're awesome!
I believe that there is also a bug in some websites or Flash 10
where even if the site is using a older version and you have Flash
10, it thinks you do not have "that particular version or newer".
I think I seen that at the adobe site.