Note: Tuts+ now have a "Download Course" feature, so this code is largely useless. But it'll remain here as an example for how to do similar things.
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Install the extension (Window > Extensions > Developer Mode > Load unpacked extension...)
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Browse to a Tuts+ Course page, press the "Download Course Videos" button at the top:
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A new window will open while the extension loads all the course video pages and extracts the download URL. The URLs are then queued behind-the-scenes to prevent Amazon S3 timeouts. They're downloaded 2 at a time (although sometimes you may get 3/4 at the start, idk).
Just DO NOT close the Tuts+ Course page you clicked the download button from. And don't open another Tuts+ Course page. Both will clear your pending downloads queue, I think. I haven't tried it, but it might do.
How do I view the pending download queue? Go to your Extensions page, find the Tuts+ Downloader, and click the link next to 'Inspect Views'. In the new Dev Tools window which pops up, press dQ to view the DownloadQueue object. Or dQ.length to see the size of the pending queue. Or dQ.queue for the URLs in the queue.
NOTE I'd like to make improvements to this to make it easier to use (especially in viewing the pending queue), and to fix the bugs which likely exist, but I'm very busy.