Note: you can set MOZ_NO_REMOTE=1 in your environment to make Firefox start a new process, rather than open a new window in the existing process. In the latest CVS (Firefox 2.0) versions, you can pass a -no-remote argument on the command line instead.
However, you might need to create a second profile (firefox -ProfileManager; firefox -P <name>) if you want to run two Firefox processes simultaneously without problems. Note: If "no-remote" were to become the default behavior, other programs that call Firefox might need to be changed to override this, to avoid creating unnecessary processes, and to prevent problems from multiple processes trying to share the same profile. I would not recommend making this the default without further investigation.
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