When I switch to 20 of Firefox, I can open only 1 window of Firefox using Windows XP

Using Windows XP with SP3
If you use Firefox 7 I am able to open multiple windows of Firefox
When I switch to 20 Firefox I can open only 1 window of Firefox

How am I able to open multiple windows of Firefox using Firefox 20?

Firefox (or Windows) display an error message if you try to open a second window?

Or is the problem change the menu (orange button Firefox) compact in Firefox 20? In Firefox 20, new window is now a choice secondary on the new tab, as shown in the attached screenshot. Historically, I press Ctrl + n, I didn't notice that until that earlier.

Edit: For the record, it is indeed Firefox 21 in the screenshot.

Tags: Firefox

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