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Open Firefox. Have one open window, and minimize it. Then, try making a New window via the menubar (File->New Window). Mine does nothing. (Command+N does work, however.) In fact, selecting anything in the menu bar right of the "Firefox" menu does nothing.
I'm using the basic Theme, with no others installed. I've checked on another profile, and it does the same thing. The problem has existed for me in the last version also.
FF v 18.104.22.168
We saw this problem as well. It happened sporadically. I made some changes one day to the preferences and have not seen it since.
In FF preferences, choose "Tabs" make sure new pages open in a new window.
next make sure "Always show the tab bar" is UNchecked
this worked for us