New answers tagged power-management
You could try installing apps like Fan Control or SMCFanControl, but generally, as you'd expect, you'll know if your fans are not working properly if your machine is getting overheated.
I don't know about SeaMonkey, not an app I've seen, but in Safari, make sure Prefs Cmd , > Advanced > Internet Plugins : 'Stop plug-ins to save power' is checked
If you need more control over when to or not to sleep, take a look at Wimoweh. It allows you to never sleep when: specific apps are running, system conditions such has high CPU usage, network connections, etc. $1 on the Mac App store
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