"For Firefox users who are constantly referring to multiple
pages, tabbed browsing is not a feature, but a way of life. There
are enough of us that the Firefox addon page lists more than 110
extensions related to tabs. These extensions feature everything
from simple add-ons to various means of saving tab addresses and
sessions to thumbnails and collections of functions, as well as one
or two uncategorizable ideas.
"If you regularly have more than half a dozen tabs open, one of
the first things you notice is how limited the default controls for
managing them can be..."