Um, here?

Debian package search tells me that the Gnash Flash plugin for Mozilla is available for alpha, amd64, arm, armel, hppa, i386, ia64, mips, mipsel, powerpc, s390, and sparc, at least for Debian users. So it at least compiles and does something on all those platforms.

It's not the official Adobe plugin, but they claim it supports at least Flash 7 and can handle YouTube.

It actually just supports sshfs and ftpfs at the moment, but people could write plugins for it to support other FUSE plugins.

I was disappointed about that too until I discovered MacFusion, which is like the sshfs GUI app, but does any FS that MacFUSE supports.