Firefox/Feature Brainstorming:Force-Quit ONE Window

I'm begging for this feature... How often does it happen that during a browsing session, you have a huge amount of windows open, one webmail (or wiki) containing a freshly composed text, unsaved... and then, unexpectedly, you open ONE webpage which freezes the whole browser! It can be a poorly designed myspace-page which tries to display 7 videos and 15 slideshows at the same time... or a binary download which isn't recognised as such, so that firefox has to open 20 Mb of gibberish in one window... or an embedded java applet which tries to fry the CPU...

Of course you can force-quit and restart Firefox, but in this worst-case example you will lose the text you just spent an hour to edit. And the most absurd, at least in my experience as a OSX user, is that you still can SWITCH among the different browser windows (with the OSX Exposé feature), but the close button isn't working...

It would be really great if Firefox, like an operating system which is able to force-quit one problematic app, could "force-quit" the troublesome window in some manner.

In such cases, it's also not a solution to simply quit and "restore the previous session", because this will also open the problematic webpage, which quite likely will crash firefox again!

Might my prayers be heard... ;)