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I came across Firefox undocumented options

-print-xpcom-dir
-print-xpcom-dirlist
-kill
-killAll
-f
-ftimeout
-fwait
-unsetDefaultMail
-foreground
-new-instance
GTK options

Perhaps someone "in the know" can comment on these or link to a reference? I tried for example firefox -kill and firefox -killAll but they seem to do nothing.

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up vote 1 down vote accepted

Only the first two exist in the source code. In fact they are sort of mummies, only read and not applied anywhere.

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