How can I prevent sites from opening private windows?

Many websites, such as Moodle (classroom tool) and YouTube try to open certain new content, especially Google-hosted content, in private windows. In may cases, such as YouTube comment panes, there is now way to avoid this, and even if there is I forget sometimes.
Private windows clog up my Recent Windows history, which I depend on for things like keeping my webcomics organized, and cannot be merged into normal windows in order to prevent this. As a result, if I don't want to do a great deal of of tab reorganizing every day, I can't use any of these sites.
Please tell me how to either disable site-opened private windows, or close private windows without them appearing in my Recently Closed Windows list. Better yet, make the latter a permanent part of the browser; a private window that leaves no traces isn't much good when a snooper can simply reopen it.

I assume that you mean pop-up windows that might be left unnoticed when they are opened behind the current Firefox window.
You can modify the behavior and change these prefs to open all links in tabs:
*http://kb.mozillazine.org/browser.link.open_newwindow<br />1: current tab; 2:new window; 3:new tab;
You can change the value of the browser.link.open_newwindow.restriction pref to 0 to open all JavaScript window.open() calls in a tab
*http://kb.mozillazine.org/browser.link.open_newwindow.restriction
You can open the <b>about:config</b> page via the location bar and accept the warning and click "I'll be careful" to continue.
*http://kb.mozillazine.org/about:config

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