FirePox
Have been using FirePox as a browser for a fair while on both our PCs, no problem. SWMBO complained today that her PC was slow. Turns out that FF is running add-ons in a separate space in order to protect FF if the add-on crashes.
Brilliant bit of software - takes 95% of the CPU and the 'puter runs like a dog. Fix is to go into about:config, which you type into the FF address bar, and then you can change a setting to turn it off. Fair enough.
So type in about:config and FF prepends www. to it and says it can't find the page. The way to turn off the prepending --- go to the configuration page by typing in about:config!
Load of pillocks!