A day or so ago I saw some instructions on how to install Flash in Firefox for just one user only. I thought it curious and dismissed it thinking I'd never use that. Well, it turns out I can use that, and I didn't save where it was. I thought I saw it here on LQ, but searches of the forums turn up no match to what I recall being part of it. I'm fairly sure it referred to ~/.mozilla/firefox/<SOMETHING>/plugins as the target to do the install. But I can't recall what was to be put there. So that's why I'm looking for it, again. So I guess it was somewhere else. Anyone know how this is done? I'll probably make a stab at trying to unpack what I get from Adobe into that directory and see what happens (in the sacrificial user's home directory, of course).

You have the idea, you just put the plugin file in that specific users /home directory. The SOMETHING you have in the path should be your profile, which is just a gibberish line of ASCII characters. It should be the only directory like it though (unless you have multiple profiles), so it's not hard to find.