Preven PC to hibernate when downloading

[JojoBE]

Add an option to prevent computer to go to sleep or hibernate modewhen downloading

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[senko3]

Torrent clients often have an option to inhibit system sleep when downloading

I'd imagine this would be the same idea and expected behavior.