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The problem of being trapped in an onbeforeclose event handler was tackled directly. You should not encounter that problem any more as of a few versions ago. (And/or you could use my Escape bookmarklet: http://dev.jeffersonscher.com/bookmarklets.html#escape)
I'm not familiar with the other issue of sites trying to download code repeatedly.
To give feature suggestions, you can use this site: https://input.mozilla.org/feedback
To file a more detailed request for enhancement you can use Bugzilla: https://bugzilla.mozilla.org/