I am using windows version of Firefox 5.0 and last few days I found that on one website (similar focus as stackexchange but in Czech), is something wrong as my browser loads it very slowly (while the connection is ok and never had problems with it). There is also another guy trying to solve the almost the same problem, but no help yet.
So I would ask, whether there is some Firefox plugin showing which page components are loading and which could help me to find out the problem. I am writing from office pc so we have blocked all the social networks like FB, Twitter etc. and I also use Adblock Plus - however, deactivating it does not have any effect on it.