Hello
since today (actually yesterday on mozilla FTPs) the new Firefox 4 is officially available with improved security and faster then ever.
Unfortunately as of now most add-ons are not yet compatible with the new version but that should change quickly.
I personally use Firefox because of some add-ons that are essential to me like Firebug, colorpicker, measureit and a few others.
Which browser are you using and why?
Now I haven't check again but I'm sure the modules I use have similar ones for chrome, I don't use anything too advanced.
Been using Google Chrome and I will never go back to FF.