#24: Duplicate tabs
Everyone knows that Ctrl+T brings up a new tab, but did you also
know that Ctrl+Z automatically sets the new tab to have the same
URL as the previous tab? It's great for duplicating windows!
#25: Shorter download notices
"YES, I KNOW ALL THE DOWNLOADS FINISHED - GO AWAY!" is a fairly
regular mental scream around here. You see, Firefox likes telling
you when all downloads are finished by bringing showing a small box
in the corner of your screen, happily obscuring anything else you
might have down there. Yes, the little download box is useful, but
no, we don't need it hanging around there for four seconds - go to
the URL about:config in Firefox and change the alerts.totalOpenTime
setting to something nice and quick, like 500 (milliseconds, ie
half a second).
#26: Firefox profiles
In the old days, running any Mozilla application twice at the same
time would usually bring up a silly profile manager screen that
didn't seem to make much sense. But with Firefox having a
billion-and-one configuration settings that can highly customise
your browsing experience, there's finally a real use for the
profile manager: you can create one full of tweaks, bookmarks,
toolbars and extensions for power browsing, and another RAM-light
profile that keeps caching to a minimum and loads a lean and mean
Firefox that's great for checking emails and reading the news.
"To get to the profile manager screen, just run Firefox with the
-profilemanager parameter, eg mozilla-firefox -profilemanager."