Thanks for reporting, but won't be fixed.
As explained elsewhere, "offlining" the request is the only reliable way to block it on Gecko 1.8.x after DNS resolution and before the HTTP headers are actually sent.
Consider this a Gecko 1.8.x bug which Mozilla will never fix on that branch, mostly because it's fixed in Gecko 1.9 and above.
Regarding 5 (disappearing notification bar), investigating.