Well, that's certainly an unpleasant situation. Others already gave some good
advice on here, so I'll just wish you good luck!
As for the technical side of things, you might want to try Shumway:
https://mozilla.github.io/shumway/
Shumway is an experimental add-on for Firefox, developed by Mozilla, which
should translate Flash into HTML5 on the run, or some such. In my experience,
it has often been lacking, but it worked better than Gnash or Lightspark did,
so certainly do give it a try!
I'm not sure if it works well with Gnash and Lightspark around. I had some
issues with newer versions of Shumway and Iceweasel, that is, it only worked
with direct links to the .swf files. But there's a #shumway channel on
irc.mozilla.org, so you can find support there if you experience issues like
that.
Run GNU, run free!
