Within the last week, there have been 2 bugs filed against sessionstore complaining about downloads autoresuming after a crash. Bug 569545 - a large download caused Firefox to hang (probably actually just an overloaded memory/cpu issue), but it couldn't be paused because the download resumed after killing Firefox. Bug 570972 - resuming downloads that are behind a login is apparently causing issues after resuming from crash
I am the creator of bug 570972. This would definately solve my kind of problem.
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