This works very well, but if you don't want it to interrupt download services like Mega.nz, you'd better add them to its whitelist. If you do, when you switch away from their tabs (even though the tabs are already loaded, right?), it can stop them in their tracks.

Has really decreased my CPU usage, great! Still, I'm finding that it kills even tabs on the whitelist. Any chance of fixing this some time soon?

Please add the option to suspend a tab as needed, not just when the specified time has elapsed.