I see this too, trace looks the same. I also (have to) use a HTTP proxy. In my GNOME proxy settings, I was using "autoconfiguration URL". I guess that's why it's using the JS stuff, to parse the PAC file. If I manually configure my proxies instead, the crash goes away (with the scrobbler plugin enabled).
So it's rhythmbox -> libsoup -> libproxy -> libmozjs triggered by having autoconfiguration URL enabled (and pointing at a valid PAC file) in the GNOME proxy settings. -- Jon Dowland
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