I'm liking FF4 so far. I was using Chrome but they never fixed my endless "Sending request" bug, no matter how many times I and others reported it, so I'm giving up on them for now.
Open your proxy settings and uncheck "Automatically detect settings" and your "Sending request" bug will be gone.
A committee takes root and grows, it flowers, wilts and dies, scattering the seed from which other committees will bloom. -- Parkinson