Possible Duplicate:
How to limit download traffic in Firefox
Throttling Bandwidth on Firefox
Simulate limited bandwidth from within Firefox?
Does anyone know how to limit download speeds in Firefox.
For example limit max download speed to 100KB/S?
I use Firefox 11 portable, Win 7 Home x64
NetLimiter(as suggested in the answers to all three questions) not useful? How does it not suit your requirements? Please be specific. Does the program/method need to be portable? Then say so. I can guess from the fact that you're using a portable copy of Firefox, but I don't want to guess. Tell me. As your question stands, NetLimiter is a viable solution (it can limit speeds to Firefox, which is your question). – Bob May 1 '12 at 15:23