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.
There is nothing so easy but that it becomes difficult when you do it reluctantly. -- Publius Terentius Afer (Terence)