Yes, just install it to a different folder. The only thing you need to make sure...

		sid0 on March 22, 2011 \| parent \| context \| favorite \| on: Firefox 4 is here Yes, just install it to a different folder. The only thing you need to make sure is to use different profiles for 3 and 4. You should edit the 3 shortcut to point to a dedicated web dev profile.