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Just plain not working. It worked before, but not now. Not sure what's wrong, and I've tried restarting it, but it just won't work. The problem isn't with Stylus, as that's working just fine.
Re: @WCGB:
Could you please press right mouse button in Duolingo when the new input doesn't show up, and then «Inspect element» -> «Console». There should be some reports about problems which could have been preventing script from working. You can screenshot it and send to enyodauk@gmail.com and i'll try to fix it :0