Note that having two Safari's in the dock is simple: just run
/Applications/Safari.app/Contents/MacOS/Safari in a terminal
Window. Those will share the same preferences and bookmarks
Although I am using Safari as the example here, this technique
can actually be applied to any Mac OS X application.
Why would you want to do this? Well, for one reason so that you
can have separate preferences or bookmarks. Another reason is
because of application crashes which take down all your open
Windows. For example, I often do things in Terminal that can crash
all my terminal sessions, but not if I keep separate instances of
Terminal open. You might want to do this with an Email application
to keep two totally separate accounts - there are all kinds of
The first step is to make an identical copy of Safari. We'll use
"ditto" for this because we may need to copy resource forks.
sudo ditto Safari.app Safari2.app
sudo mv MacOS/Safari MacOS/Safari2
Now we need to edit Info.plist. Basically, any place it says
Safari will be changed to Safari2. The most important change is
because that is your ~/Library/Preferences location, and we need
it to be different for these two versions. Here are the other
If you aren't sure whether something needs to be changed, leave
it alone and try running the app. If it works as you expect, then
you are fine.
One thing that won't change with Safari is its default home
page. That's because Safari looks instead in
~/Library/Preferences/com.apple.internetconfig.plist for that
Once this is done, you can run the new Safari2 and if you change
its preferences, that has no effect on the original Safari.
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