update: they killed the -remote flag in 39 (https://bugzilla.mozilla.org/show_bug.cgi?id=1080319 …), but -new-tab finally works correctly with -P.
How to open a url in a specific firefox -P profile -new-instance: firefox -P profile -remote "openURL($url, new-tab)"
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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