well not much to be said. they state its open source so it may be possible i think? not sure. this is dw page:
http://wiki.phoenixviewer.com/doku.php?id=downloads
for firestorm
https://secondlife.com/support/downloads/
for official and third party viewers
all i see browsing here are old requests but one. maybe this will refresh the thing 
thx!
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I too would like to see a fully portable version of this app, it really grates me if I have to do a system restore and all my settings get lost because I forgot to backup the roaming folder. Don't really get why the firestorm team theselves are so against doing it.
Yep, would love this, as I stupidly installed Windows XP onto a 6G partition - and as my Documents and Settings is on there, it keeps filling up with Firestorm texture cache.
He's got the lot, this bloke - mobile filofax, stripy glasses, portable shirt