Thanks for replying. What you say is probably true, but middle-click works when NoScript is disabled, immediately stops working when NS is enabled.
Don, on the face of it, you are right, it seems it might be affected by NS. But I am going to say coincidence. I believe whatever IS in fact blocking this is incidentally exposed by NS and therefore when you take it out of the equation, it seems to resolve the issue. Maybe your mouse vendor has some weird special scroll or function that they inject using overlays into applications and in Fx it is somehow coming to clash with NS and breaks it. Do you happen to have that asinine Logitech control center, whatever its called, installed to run on the system tray and as a service when you installed the drivers? If so, my money is almost 100% on that. I recently had to replace my mouse (after using this trackball for almost 12 years) and right off the bat I plug in this new bluetooth mouse and it surely installed this massively and unnecessary crap center of stuff and it started causing me problems with all kinds of stuff. So I just went to the registry and just whacked all traces of it from my system and left the residual stuff in case the driver needs it but the interface is GONE and so are my problems. Its a shame when a company tries to shove their crap onto people, like HP's print center. ARGH! I wish they would stick to just hardware and leave the software layer to the ones who know what they are doing.